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**Time Value of Money: Valuing Cash Flow Streams**

Chapter 4 Time Value of Money: Valuing Cash Flow Streams

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**Chapter Outline 4.1 Valuing a Stream of Cash Flows 4.2 Perpetuities**

4.3 Annuities 4.4 Growing Cash Flows 4.5 Solving for Variables Other Than Present Value or Future Value

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**Learning Objectives Value a series of many cash flows**

Value a perpetual series of regular cash flows called a perpetuity Value a common set of regular cash flows called an annuity Value both perpetuities and annuities when the cash flows grow at a constant rate Compute the number of periods, cash flow, or rate of return in a loan or investment

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**4.1 Valuing a Stream of Cash Flows**

Rules developed in Chapter 3: Rule 1: Only values at the same point in time can be compared or combined. Rule 2: To calculate a cash flow’s future value, we must compound it. Rule 3: To calculate the present value of a future cash flow, we must discount it.

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**4.1 Valuing a Stream of Cash Flows**

Applying the Rules of Valuing Cash Flows Suppose we plan to save $1,000 today, and $1,000 at the end of each of the next two years. If we earn a fixed 10% interest rate on our savings, how much will we have three years from today?

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**4.1 Valuing a Stream of Cash Flows**

We can do this in several ways. First, take the deposit at date 0 and move it forward to date 1. Combine those two amounts and move the combined total forward to date 2.

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**4.1 Valuing a Stream of Cash Flows**

Continuing in the same fashion, we can solve the problem as follows:

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**4.1 Valuing a Stream of Cash Flows**

Another approach is to compute the future value in year 3 of each cash flow separately. Once all amounts are in year 3 dollars, combine them.

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**4.1 Valuing a Stream of Cash Flows**

Consider a stream of cash flows: C0 at date 0, C1 at date 1, and so on, up to CN at date N. We compute the present value of this cash flow stream in two steps.

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**4.1 Valuing a Stream of Cash Flows**

First, compute the present value of each cash flow. Then combine the present values.

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**Example 4.1 Present Value of a Stream of Cash Flows**

Problem: You have just graduated and need money to buy a new car. Your rich Uncle Henry will lend you the money so long as you agree to pay him back within four years. You offer to pay him the rate of interest that he would otherwise get by putting his money in a savings account.

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**Example 4.1 Present Value of a Stream of Cash Flows (cont’d)**

Problem: Based on your earnings and living expenses, you think you will be able to pay him $5000 in one year, and then $8000 each year for the next three years. If Uncle Henry would otherwise earn 6% per year on his savings, how much can you borrow from him?

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**Example 4.1 Present Value of a Stream of Cash Flows (cont’d)**

Solution: Plan: The cash flows you can promise Uncle Henry are as follows: Uncle Henry should be willing to give you an amount equal to these payments in present value terms.

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**Example 4.1 Present Value of a Stream of Cash Flows (cont’d)**

Plan: We will: Solve the problem using equation 4.1 Verify our answer by calculating the future value of this amount.

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**Example 4.1 Present Value of a Stream of Cash Flows (cont’d)**

Execute: We can calculate the PV as follows:

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**Example 4.1 Present Value of a Stream of Cash Flows (cont’d)**

Execute: Now, suppose that Uncle Henry gives you the money, and then deposits your payments in the bank each year. How much will he have four years from now?

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**Example 4.1 Present Value of a Stream of Cash Flows (cont’d)**

Execute: We need to compute the future value of the annual deposits. One way is to compute the bank balance each year.

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**Example 4.1 Present Value of a Stream of Cash Flows (cont’d)**

Execute: To verify our answer, suppose your uncle kept his $24, in the bank today earning 6% interest. In four years he would have: FV= $24,890.65×(1.06)4=$31, in 4 years

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**Example 4.1 Present Value of a Stream of Cash Flows (cont’d)**

Evaluate: Thus, Uncle Henry should be willing to lend you $24, in exchange for your promised payments. This amount is less than the total you will pay him ($5000+$8000+$8000+$8000=$29,000) due to the time value of money.

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**Example 4.1a Present Value of a Stream of Cash Flows**

Problem: You have just graduated and need money to pay the deposit on an apartment. Your rich aunt will lend you the money so long as you agree to pay her back within six months. You offer to pay her the rate of interest that she would otherwise get by putting her money in a savings account.

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**Example 4.1a Present Value of a Stream of Cash Flows (cont’d)**

Problem: Based on your earnings and living expenses, you think you will be able to pay her $70 next month, $85 in each of the next two months, and then $900 each month for months 4 through 6. If your aunt would otherwise earn 6% per year on her savings, how much can you borrow from her?

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**Example 4.1a Present Value of a Stream of Cash Flows (cont’d)**

Solution: Plan: The cash flows you can promise your aunt are as follows: She should be willing to give you an amount equal to these payments in present value terms.

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**Example 4.1a Present Value of a Stream of Cash Flows (cont’d)**

Plan: We will: Solve the problem using equation 4.1 Verify our answer by calculating the future value of this amount.

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**Example 4.1a Present Value of a Stream of Cash Flows (cont’d)**

Execute: We can calculate the PV as follows:

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**Example 4.1a Present Value of a Stream of Cash Flows (cont’d)**

Execute: Now, suppose that your aunt gives you the money, and then deposits your payments in the bank each month. How much will she have six months from now?

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**Example 4.1a Present Value of a Stream of Cash Flows (cont’d)**

Execute: We need to compute the future value of the monthly deposits. One way is to compute the bank balance each month.

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**Example 4.1a Present Value of a Stream of Cash Flows (cont’d)**

Execute: To verify our answer, suppose your aunt kept her $ in the bank today earning 6% interest. In six months she would have: FV= $500.90×(1.005)6=$ in 6 months

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**Example 4.1a Present Value of a Stream of Cash Flows (cont’d)**

Evaluate: Thus, your aunt should be willing to lend you $ in exchange for your promised payments. This amount is less than the total you will pay her ($70+$85+$85+$90+$90+$90=$510) due to the time value of money.

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**4.1 Valuing a Stream of Cash Flows**

Using a Financial Calculator: Solving for Present and Future Values Financial calculators and spreadsheets have the formulas pre-programmed to quicken the process. There are five variables used most often: N PV PMT FV I/Y

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**4.1 Valuing a Stream of Cash Flows**

Example 1: Suppose you plan to invest $20,000 in an account paying 8% interest. How much will you have in the account in 15 years? To compute the solution, we enter the four variables we know and solve for the one we want to determine, FV.

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**4.1 Valuing a Stream of Cash Flows**

Example 1: For the HP-10BII or the TI-BAII Plus calculators: Enter 15 and press the N key. Enter 8 and press the I/Y key (I/YR for the HP) Enter -20,000 and press the PV key. Enter 0 and press the PMT key. Press the FV key (for the TI, press “CPT” and then “FV”).

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**4.1 Valuing a Stream of Cash Flows**

Given: 15 8 -20,000 Solve for: 63,443 Excel Formula: = FV(0.08,15,0,-20000) Notice that we entered PV (the amount we’re putting in to the bank) as a negative number and FV is shown as a positive number (the amount we take out of the bank). It is important to enter the signs correctly to indicate the direction the funds are flowing.

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**Example 4.2 Computing the Future Value**

Problem: Let’s revisit the savings plan we considered earlier. We plan to save $1000 today and at the end of each of the next two years. At a fixed 10% interest rate, how much will we have in the bank three years from today?

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**Example 4.2 Computing the Future Value (cont’d)**

Solution: Plan: We’ll start with the timeline for this savings plan: Let’s solve this in a different way than we did in the text, while still following the rules.

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**Example 4.2 Computing the Future Value (cont’d)**

Plan: First we’ll compute the present value of the cash flows. Then we’ll compute its value three years later (its future value).

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**Example 4.2 Computing the Future Value (cont’d)**

Execute: There are several ways to calculate the present value of the cash flows. Here, we treat each cash flow separately an then combine the present values.

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**Example 4.2 Computing the Future Value (cont’d)**

Execute: Saving $ today is equivalent to saving $1000 per year for three years. Now let’s compute future value in year 3 of that $ :

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**Example 4.2 Computing the Future Value (cont’d)**

Evaluate: The answer of $3641 is precisely the same result we found earlier. As long as we apply the three rules of valuing cash flows, we will always get the correct answer.

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4.2 Perpetuities The formulas we have developed so far allow us to compute the present or future value of any cash flow stream. Now we will consider two types of cash flow streams: Perpetuities Annuities

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**4.2 Perpetuities Perpetuities**

A perpetuity is a stream of equal cash flows that occur at regular intervals and last forever. Here is the timeline for a perpetuity: the first cash flow does not occur immediately; it arrives at the end of the first period

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4.2 Perpetuities Using the formula for present value, the present value of a perpetuity with payment C and interest rate r is given by: Notice that all the cash flows are the same. Also, the first cash flow starts at time 1.

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4.2 Perpetuities Let’s derive a shortcut by creating our own perpetuity. Suppose you can invest $100 in a bank account paying 5% interest per year forever. At the end of the year you’ll have $105 in the bank – your original $100 plus $5 in interest.

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4.2 Perpetuities Suppose you withdraw the $5 and reinvest the $100 for another year. By doing this year after year, you can withdraw $5 every year in perpetuity:

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4.2 Perpetuities To generalize, suppose we invest an amount P at an interest rate r. Every year we can withdraw the interest we earned, C=r × P, leaving P in the bank. Because the cost to create the perpetuity is the investment of principal, P, the value of receiving C in perpetuity is the upfront cost, P.

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4.2 Perpetuities Present Value of a Perpetuity (Eq. 4.4)

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**Example 4.3 Endowing a Perpetuity**

Problem: You want to endow an annual graduation party at your alma mater. You want the event to be a memorable one, so you budget $30,000 per year forever for the party. If the university earns 8% per year on its investments, and if the first party is in one year’s time, how much will you need to donate to endow the party?

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**Example 4.3 Endowing a Perpetuity (cont’d)**

Solution: Plan: The timeline of the cash flows you want to provide is: This is a standard perpetuity of $30,000 per year. The funding you would need to give the university in perpetuity is the present value of this cash flow stream

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**Example 4.3 Endowing a Perpetuity (cont’d)**

Execute: From the formula for a perpetuity,

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**Example 4.3 Endowing a Perpetuity (cont’d)**

Evaluate: If you donate $375,000 today, and if the university invests it at 8% per year forever, then the graduates will have $30,000 every year for their graduation party.

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**Example 4.3a Endowing a Perpetuity**

Problem: You just won the lottery, and you want to endow a professorship at your alma mater. You are willing to donate $4 million of your winnings for this purpose. If the university earns 5% per year on its investments, and the professor will be receiving her first payment in one year, how much will the endowment pay her each year?

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**Example 4.3a Endowing a Perpetuity (cont’d)**

Solution: Plan: The timeline of the cash flows you want to provide is: This is a standard perpetuity. The amount she can withdraw each year and keep the principal intact is the cash flow when solving equation 4.4.

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**Example 4.3a Endowing a Perpetuity (cont’d)**

Execute: From the formula for a perpetuity,

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**Example 4.3a Endowing a Perpetuity (cont’d)**

Evaluate: If you donate $4,000,000 today, and if the university invests it at 5% per year forever, then the chosen professor will receive $200,000 every year.

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4.3 Annuities Annuities An annuity is a stream of N equal cash flows paid at regular intervals. The difference between an annuity and a perpetuity is that an annuity ends after some fixed number of payments

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**4.3 Annuities Present Value of An Annuity**

Note that, just as with the perpetuity, we assume the first payment takes place one period from today. To find a simpler formula, use the same approach as we did with a perpetuity: create your own annuity.

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4.3 Annuities With an initial $100 investment at 5% interest, you can create a 20-year annuity of $5 per year, plus you will receive an extra $100 when you close the account at the end of 20 years:

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4.3 Annuities The Law of One Price tells us that because it only took an initial investment of $100 to create the cash flows on the timeline, the present value of these cash flows is $100: Copyright © 2009 Pearson Prentice Hall. All rights reserved.

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4.3 Annuities Rearranging:

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4.3 Annuities We usually want to know the PV as a function of C, r, and N. Since C can be written as $100(0.05)=$5, we can further re-arrange:

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4.3 Annuities In general:

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**Example 4.4 Present Value of a Lottery Prize Annuity**

Problem: You are the lucky winner of the $30 million state lottery. You can take your prize money either as (a) 30 payments of $1 million per year (starting today), or (b) $15 million paid today. If the interest rate is 8%, which option should you take?

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**Example 4.4 Present Value of a Lottery Prize Annuity (cont’d)**

Solution: Plan: Option (a) provides $30 million in prize money but paid over time. To evaluate it correctly, we must convert it to a present value. Here is the timeline:

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**Example 4.4 Present Value of a Lottery Prize Annuity (cont’d)**

Plan (cont’d): Because the first payment starts today, the last payment will occur in 29 years (for a total of 30 payments). The $1 million at date 0 is already stated in present value terms, but we need to compute the present value of the remaining payments. Fortunately, this case looks like a 29-year annuity of $1 million per year, so we can use the annuity formula.

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**Example 4.4 Present Value of a Lottery Prize Annuity (cont’d)**

Execute: From the formula for an annuity,

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**Example 4.4 Present Value of a Lottery Prize Annuity (cont’d)**

Execute (cont’d): Thus, the total present value of the cash flows is $1 million + $11.16 million = $12.16 million. In timeline form:

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**Example 4.4 Present Value of a Lottery Prize Annuity (cont’d)**

Execute (cont’d): Financial calculators or Excel can handle annuities easily—just enter the cash flow in the annuity as the PMT: Given: 29 8.0 1,000,000 Solve for: -11,158,406 Excel Formula: =PV(RATE,NPER, PMT, FV) = PV(0.08,29, ,0)

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**Example 4.4 Present Value of a Lottery Prize Annuity (cont’d)**

Evaluate: The reason for the difference is the time value of money. If you have the $15 million today, you can use $1 million immediately and invest the remaining $14 million at an 8% interest rate. This strategy will give you $14 million 8% = $1.12 million per year in perpetuity! Alternatively, you can spend $15 million – $11.16 million = $3.84 million today, and invest the remaining $11.16 million, which will still allow you to withdraw $1 million each year for the next 29 years before your account is depleted.

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**Example 4.4a Present Value of an Annuity**

Problem: Your parents have made you an offer you can’t refuse. They’re planning to give you part of your inheritance early. They’ve given you a choice. They’ll pay you $10,000 per year for each of the next seven years (beginning today) or they’ll give you their 2007 BMW M6 Convertible, which you can sell for $61,000 (guaranteed) today. If you can earn 7% annually on your investments, which should you choose?

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**Example 4.4a Present Value of an Annuity (cont’d)**

Solution: Plan: Option (a) provides $10,000 paid over time. To evaluate it correctly, we must convert it to a present value. Here is the timeline:

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**Example 4.4a Present Value of an Annuity (cont’d)**

Plan (cont’d): The $10,000 at date 0 is already stated in present value terms, but we need to compute the present value of the remaining payments. Fortunately, this case looks like a 6-year annuity of $10,000 per year, so we can use the annuity formula.

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**Example 4.4a Present Value of an Annuity (cont’d)**

Execute: From the formula for a annuity,

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**Example 4.4a Present Value of an Annuity (cont’d)**

Execute (cont’d): Thus, the total present value of the cash flows is $10,000 + $47,665. In timeline form:

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**Example 4.4a Present Value of an Annuity (cont’d)**

Execute (cont’d): Financial calculators or Excel can handle annuities easily—just enter the cash flow in the annuity as the PMT: Given: 6 7 10000 Solve for: -47,665 Excel Formula: =PV(RATE,NPER, PMT, FV) = PV(0.07,6,10000,0)

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**Example 4.4a Present Value of an Annuity (cont’d)**

Evaluate: Lucky you! Even if you don’t want to keep it, the fact that you can sell it for more than the annuity is worth means you’re better off taking the BMW.

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4.3 Annuities Future Value of an Annuity (Eq. 4.6)

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**Example 4.5 Retirement Savings Plan Annuity**

Problem: Ellen is 35 years old, and she has decided it is time to plan seriously for her retirement. At the end of each year until she is 65, she will save $10,000 in a retirement account. If the account earns 10% per year, how much will Ellen have saved at age 65?

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**Example 4.5 Retirement Savings Plan Annuity (cont’d)**

Solution Plan: As always, we begin with a timeline. In this case, it is helpful to keep track of both the dates and Ellen’s age:

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**Example 4.5 Retirement Savings Plan Annuity (cont’d)**

Plan (cont’d): Ellen’s savings plan looks like an annuity of $10,000 per year for 30 years. (Hint: It is easy to become confused when you just look at age, rather than at both dates and age. A common error is to think there are only = 29 payments. Writing down both dates and age avoids this problem.) To determine the amount Ellen will have in the bank at age 65, we’ll need to compute the future value of this annuity.

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**Example 4.5 Retirement Savings Plan Annuity**

Execute: Using Financial calculators or Excel: Given: 30 10.0 -10,000 Solve for: -1,644,940 Excel Formula: =FV(RATE,NPER, PMT, PV) = FV(0.10,30,10000,0)

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**Example 4.5 Retirement Savings Plan Annuity**

Evaluate: By investing $10,000 per year for 30 years (a total of $300,000) and earning interest on those investments, the compounding will allow her to retire with $1.645 million.

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**Example 4.5a Retirement Savings Plan Annuity**

Problem: Adam is 25 years old, and he has decided it is time to plan seriously for his retirement. He will save $10,000 in a retirement account at the end of each year until he is 45. At that time, he will stop paying into the account, though he does not plan to retire until he is 65. If the account earns 10% per year, how much will Adam have saved at age 65?

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**Example 4.5a Retirement Savings Plan Annuity**

Solution Plan: As always, we begin with a timeline. In this case, it is helpful to keep track of both the dates and Adam’s age:

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**Example 4.5a Retirement Savings Plan Annuity**

Adam’s savings plan looks like an annuity of $10,000 per year for 20 years. The money will then remain in the account until Adam is 65 – 20 more years. To determine the amount Adam will have in the bank at age 45, we’ll need to compute the future value of this annuity. Then we’ll compound the future value into the future 20 more years to see how much he’ll have at 65.

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**Example 4.5a Retirement Savings Plan Annuity**

Execute: Using Financial calculators or Excel: Given: 20 10.0 -10,000 Solve for: $572,750 Excel Formula: =FV(RATE,NPER, PMT, PV) = FV(0.10,20,10000,0)

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**Example 4.5a Retirement Savings Plan Annuity**

Execute: Using Financial calculators or Excel: Given: 20 10.0 -$572,750 Solve for: $3,853,175 Excel Formula: =FV(RATE,NPER, PMT, PV) = FV(0.10,20,0, )

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**Example 4.5a Retirement Savings Plan Annuity**

Evaluate: By investing $10,000 per year for 20 years (a total of $200,000) and earning interest on those investments, the compounding will allow him to retire with $3.85 million. Even though he invested for 10 fewer years than Ellen did, Adam will end up with more than twice as much money because he’s starting his retirement plan ten years earlier than she will.

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4.4 Growing Cash Flows A growing perpetuity is a stream of cash flows that occur at regular intervals and grow at a constant rate forever. For example, a growing perpetuity with a first payment of $100 that grows at a rate of 3% has the following timeline:

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4.4 Growing Cash Flows Present Value of a Growing Perpetuity (Eq. 4.7)

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**Example 4.6 Endowing a Growing Perpetuity**

Problem: In Example 4.3, you planned to donate money to your alma mater to fund an annual $30,000 graduation party. Given an interest rate of 8% per year, the required donation was the present value of PV=$30,000/0.08=$375,000. Before accepting the money, however, the student association has asked that you increase the donation to account for the effect of inflation on the cost of the party in future years. Although $30,000 is adequate for next year’s party, the students estimate that the party’s cost will rise by 4% per year thereafter. To satisfy their request, how much do you need to donate now?

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**Example 4.6 Endowing a Growing Perpetuity (cont’d)**

Solution: Plan: The cost of the party next year is $30,000, and the cost then increases 4% per year forever. From the timeline, we recognize the form of a growing perpetuity and can value it that way.

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**Example 4.6 Endowing a Growing Perpetuity (cont’d)**

Execute: To finance the growing cost, you need to provide the present value today of:

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**Example 4.6 Endowing a Growing Perpetuity (cont’d)**

Evaluate: You need to double the size of your gift!

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**Example 4.6a Endowing a Growing Perpetuity**

Problem: In Example 4.3a, you planned to donate $4 million to your alma mater to fund an endowed professorship. Given an interest rate of 7% per year, the professor would be able to collect $200,000 per year from your generosity. The inflation rate is expected to be 2% per year. How much can the professor be paid in the first year in order to allow her annual salary to increase by 2% each year and keep the principal intact?

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**Example 4.6a Endowing a Growing Perpetuity (cont’d)**

Solution: Plan: The salary needs to increase 2% per year forever. From the timeline, we recognize the form of a growing perpetuity and can value it that way.

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**Example 4.6a Endowing a Growing Perpetuity (cont’d)**

Evaluate: She can only withdraw $120,000 in her first year. In the second year, her payment will be $120,000 X 1.02 = $122,400 and the payments will continue to increase each year.

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**4.4 Growing Cash Flows Present Value of a Growing Annuity**

A growing annuity is a stream of N growing cash flows, paid at regular intervals It is a growing perpetuity that eventually comes to an end.

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4.4 Growing Cash Flows The following timeline shows a growing annuity with initial cash flow C, growing at a rate of g every period until period N:

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4.4 Growing Cash Flows Present Value of a Growing Annuity:

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**Example 4.7 Retirement Savings with a Growing Annuity**

Problem: In Example 4.5, Ellen considered saving $10,000 per year for her retirement. Although $10,000 is the most she can save in the first year, she expects her salary to increase each year so that she will be able to increase her savings by 5% per year. With this plan, if she earns 10% per year on her savings, how much will Ellen have saved at age 65?

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**Example 4.7 Retirement Savings with a Growing Annuity (cont’d)**

Solution: Plan: Her new savings plan is represented by the following timeline: This example involves a 30-year growing annuity with a growth rate of 5% and an initial cash flow of $10,000. We can use Eq. 4.8 to solve for the present value of a growing annuity.

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**Example 4.7 Retirement Savings with a Growing Annuity (cont’d)**

Execute: The present value of Ellen’s growing annuity is given by:

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**Example 4.7 Retirement Savings with a Growing Annuity (cont’d)**

Execute: Ellen’s proposed savings plan is equivalent to having $150,463 in the bank today. To determine the amount she will have at age 65, we need to move this amount forward 30 years:

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**Example 4.7 Retirement Savings with a Growing Annuity (cont’d)**

Evaluate: Ellen will have saved $2.625 million at age 65 using the new savings plan. This sum is almost $1 million more than she had without the additional annual increases in savings. Because she is increasing her savings amount each year and the interest on the cumulative increases continues to compound, her final savings is much greater.

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**Example 4.7a Retirement Savings with a Growing Annuity**

Problem: In Example 4.5a, Adam considered saving $10,000 per year for his retirement. Although $10,000 is the most he can save in the first year, he expects his salary to increase each year so that he will be able to increase his savings by 4% per year. With this plan, if he earns 10% per year on his savings, how much will Adam have saved at age 65?

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**Example 4.7a Retirement Savings with a Growing Annuity (cont’d)**

Solution: Plan: His new savings plan is represented by the following timeline: This example involves a 20-year growing annuity with a growth rate of 4% and an initial cash flow of $10,000. We can use Eq. 4.8 to solve for the present value of a growing annuity.

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**Example 4.7a Retirement Savings with a Growing Annuity (cont’d)**

Execute: The present value of Adam’s growing annuity is given by:

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**Example 4.7a Retirement Savings with a Growing Annuity (cont’d)**

Execute: Adam’s proposed savings plan is equivalent to having $112,384 in the bank today. To determine the amount he will have at age 65, we need to move this amount forward 40 years:

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**Example 4.7a Retirement Savings with a Growing Annuity (cont’d)**

Evaluate: Adam will have saved $5.086 million at age 65 using the new savings plan. This sum is over $1 million more than he had without the additional annual increases in savings. Because he is increasing his savings amount each year and the interest on the cumulative increases continues to compound, his final savings is much greater.

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**4.5 Solving for Variables Other Than Present Value or Future Value**

In some situations, we use the present and/or future values as inputs, and solve for the variable we are interested in. We examine several special cases in this section.

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**4.5 Solving for Variables Other Than Present Value or Future Value**

Solving for Cash Flows (Eq. 4.8)

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**Example 4.8 Computing a Loan Payment**

Problem: Your firm plans to buy a warehouse for $100,000. The bank offers you a 30-year loan with equal annual payments and an interest rate of 8% per year. The bank requires that your firm pay 20% of the purchase price as a down payment, so you can borrow only $80,000. What is the annual loan payment?

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**Example 4.8 Computing a Loan Payment (cont’d)**

Solution: Plan: We start with the timeline (from the bank’s perspective): Using Eq. 4.8, we can solve for the loan payment, C, given N=30, r = 8% (0.08) and P=$80,000

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**Example 4.8 Computing a Loan Payment (cont’d)**

Execute: Eq. 4.8 gives the payment (cash flow) as follows:

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**Example 4.8 Computing a Loan Payment (cont’d)**

Execute (cont’d): Using a financial calculator or Excel: Given: 30 8.0 -80,000 Solve for: Excel Formula: =PMT(RATE,NPER, PV, FV) = PMT(0.08,30,-80000,0)

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**Example 4.8 Computing a Loan Payment (cont’d)**

Evaluate: Your firm will need to pay $7, each year to repay the loan. The bank is willing to accept these payments because the PV of 30 annual payments of $7, at 8% interest rate per year is exactly equal to the $80,000 it is giving you today.

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**Example 4.8a Computing a Loan Payment**

Problem: Suppose you accept your parents’ offer of a 2007 BMW M6 convertible, but that’s not the kind of car you want. Instead, you sell the car for $61,000, spend $11,000 on a used Corolla, and use the remaining $50,000 as a down payment for a house. The bank offers you a 30-year loan with equal monthly payments and an interest rate of 6% per year, and requires a 20% down payment. How much can you borrow, and what will be the payment on the loan?

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**Example 4.8a Computing a Loan Payment (cont’d)**

Solution: Plan: To calculate the amount we can borrow, we need to find out what amount $50,000 is 20% of: $50,000 = .2 X Value Value = $50,000/.2 = $250,000 Because you’ll be putting $50,000 down, your loan amount will be $250,000 - $50,000 = $200,000.

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**Example 4.8a Computing a Loan Payment (cont’d)**

Solution: Plan: We start with the timeline: Note, we need to use the monthly interest rate. Since the quoted rate is an APR, we can just divide the annual rate by 12: r = .06/12 = .005

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**Example 4.8a Computing a Loan Payment (cont’d)**

Execute: Eq. 4.8 gives the payment (cash flow) as follows: = $1,199.10

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**Example 4.8a Computing a Loan Payment (cont’d)**

Execute (cont’d): Using a financial calculator or Excel: Given: 360 0.5 200,000 Solve for: Excel Formula: =PMT(RATE,NPER, PV, FV) = PMT(0.005,360,200000,0)

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**4.5 Solving for Variables Other Than Present Value or Future Value**

Rate of Return The rate of return is the rate at which the present value of the benefits exactly offsets the cost.

122
**4.5 Solving for Variables Other Than Present Value or Future Value**

Suppose you have an investment opportunity that requires a $1000 investment today and will pay $2000 in six years. What interest rate, r, would you need so that the present value of what you get is exactly equal to the present value of what you give up?

123
**4.5 Solving for Variables Other Than Present Value or Future Value**

Rearranging:

124
**4.5 Solving for Variables Other Than Present Value or Future Value**

Suppose your firm needs to purchase a new forklift. The dealer gives you two options: A price for the forklift if you pay cash ($40,000) The annual payments if you take out a loan from the dealer (no money down and four annual payments of $15,000).

125
**4.5 Solving for Variables Other Than Present Value or Future Value**

Setting the present value of the cash flows equal to zero requires that the present value of the payments equals the purchase price: The solution for r is the interest rate charged by the dealer, which you can compare to the rate charged by your bank.

126
**4.5 Solving for Variables Other Than Present Value or Future Value**

There is no simple way to solve for the interest rate. The only way to solve this equation is to guess at values for r until you find the right one. An easier solution is to use a financial calculator or a spreadsheet.

127
**4.5 Solving for Variables Other Than Present Value or Future Value**

Given: 4 40,000 -15,000 Solve for: 18.45 Excel Formula: =RATE(NPER,PMT,PV,FV)=Rate(4,-25000,40000,0)

128
**Example 4.9 Computing the Rate of Return with a Financial Calculator**

Problem: Let’s return to the lottery example (Example 4.4). How high of a rate of return do you need to earn investing on your own in order to prefer the $15 million payout?

129
**Example 4.9 Computing the Rate of Return with a Financial Calculator**

Solution: Plan: We need to solve for the rate of return that makes the two offers equivalent. Anything above that rate of return would make the present value of the annuity lower than the $15 million lump sum payment and anything below that rate of return would make it greater than the $15 million.

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**Example 4.9 Computing the Rate of Return with a Financial Calculator**

Execute: Given: 29 -14,000,000 1,000,000 Solve for: 5.72 Excel Formula: =RATE(NPER, PMT, PV,FV) = RATE(29, ,‑ ,0) The rate equating the two options is 5.72%.

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**Example 4.9 Computing the Rate of Return with a Financial Calculator**

Evaluate: 5.72% is the rate of return that makes giving up the $15 million payment and taking the 30 installments of $1 million exactly a zero NPV action. If you could earn more than 5.72% investing on your own, then you could take the $15 million, invest it and generate thirty installments that are each more than $1 million. If you could not earn at least 5.72% on your investments, you would be unable to replicate the $1 million installments on your own and would be better off taking the installment plan.

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**Example 4.9a Computing the Internal Rate of Return with a Financial Calculator**

Problem: Let’s return to the BMW example (Example 4.4a). What rate of return would make you indifferent between the car and the $10,000 per year payout (even if the car is your favorite color and has HD radio)?

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**Example 4.9a Computing the Internal Rate of Return with a Financial Calculator**

Solution: Plan: We need to solve for the rate of return that makes the two offers equivalent. Anything above that rate of return would make the present value of the annuity lower than the $61,000 car and anything below that rate of return would make it greater than the $61,000.

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**Example 4.9a Computing the Internal Rate of Return with a Financial Calculator**

Execute: Given: 6 -51,000 10,000 Solve for: 4.85% Excel Formula: =RATE(NPER, PMT, PV,FV) = RATE(6,10000,‑61000,0) The rate equating the two options is 4.85%.

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**Example 4.9a Computing the Internal Rate of Return with a Financial Calculator**

Evaluate: 4.85% is the rate of return that makes giving up the $61,000 car and taking the 7 installments of $10,000 exactly a zero NPV action. If you can earn more than 4.85% investing on your own, then you can take the $61,000, invest it and generate seven installments that are each more than $10,000. If you can not earn at least 4.85% on your investments, you would be unable to replicate the $10,000 installments on your own and would be better off taking the generous payments your parents have offered.

136
**4.6 Solving for Variables Other Than Present Value or Future Value**

Solving for the Number of Periods In addition to solving for cash flows or the interest rate, we can solve for the amount of time it will take a sum of money to grow to a known value. In this case, the interest rate, present value, and future value are all known. We need to compute how long it will take for the present value to grow to the future value.

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**Example 4.10 Solving for the Number of Periods in a Savings Plan**

Problem: Let’s return to saving for a down payment on a house. Imagine that some time has passed and you have $10,050 saved already, and you can now afford to save $5,000 per year at the end of each year. Also, interest rates have increased so that you now earn 7.25% per year on your savings. How long will it take you to get to your goal of $60,000?

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**Example 4.10 Solving for the Number of Periods in a Savings Plan**

Solution: Plan: The timeline for this problem is

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**Example 4.10 Solving for the Number of Periods in a Savings Plan**

Plan (cont’d): We need to find N so that the future value of our current savings plus the future value of our planned additional savings (which is an annuity) equals our desired amount. There are two contributors to the future value: the initial lump sum $10,050 that will continue to earn interest, and the annuity contributions of $5,000 per year that will earn interest as they are contributed. Thus, we need to find the future value of the lump sum plus the future value of the annuity

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**Example 4.10 Solving for the Number of Periods in a Savings Plan**

Execute: Given: 7.25 -10,050 -5,000 60,000 Solve for: 7 Excel Formula: =NPER(RATE,PMT, PV, FV) = NPER(0.0725,‑5000,‑10050,60000)

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**Example 4.10 Solving for the Number of Periods in a Savings Plan**

Evaluate: It will take seven years to save the down payment.

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**Example 4.10a Solving for the Number of Periods in a Savings Plan**

Problem: Let’s return to Ellen and Adam. Suppose Ellen decides she will continue working until she has as much at retirement as her brother, Adam, will have when he retires. She will continue to contribute $10,000 each year to her retirement account. How much longer will she need to work to tie the competition with her brother?

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**Example 4.10a Solving for the Number of Periods in a Savings Plan**

Solution: Plan: The timeline for this problem is

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**Example 4.10a Solving for the Number of Periods in a Savings Plan**

Plan (cont’d): We need to find N so that the FV of the $1,645,000 she’ll have at age 65 plus the $10,000 she’ll contribute each year is equal to $3,850,000. Remember, she’s earning 10% on her investments.

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**Example 4.10a Solving for the Number of Periods in a Savings Plan**

Execute: Given: 10 -10,000 Solve for: 8.57 Excel Formula: =NPER(RATE,PMT, PV, FV) = NPER(0.10,‑10000,‑ , )

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**Example 4.10a Solving for the Number of Periods in a Savings Plan**

Evaluate: Ellen will have to work until she’s 73 ½ years old. (Here’s hoping she really loves her job!)

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Chapter Quiz How do you calculate the present value of a cash flow stream? What is the intuition behind the fact that an infinite stream of cash flows has a finite present value? What are some examples of annuities? What is the difference between an annuity and a perpetuity? What is an example of a growing perpetuity? How do you calculate the cash flow of an annuity? How do you calculate the rate of return on an investment?

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Present value, annuity, perpetuity

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