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3-1 Time Value of Money

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3-2 After studying, you should be able to: 1. Understand what is meant by "the time value of money." 2. Understand the relationship between present and future value. 3. Describe how the interest rate can be used to adjust the value of cash flows – both forward and backward – to a single point in time. 4. Calculate both the future and present value of: (a) an amount invested today; (b) a stream of equal cash flows (an annuity); and (c) a stream of mixed cash flows. 5. Distinguish between an “ordinary annuity” and an “annuity due.” 6. Use interest factor tables and understand how they provide a shortcut to calculating present and future values. 7. Use interest factor tables to find an unknown interest rate or growth rate when the number of time periods and future and present values are known. 8. Build an “amortization schedule” for an installment-style loan.

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3-3 The Time Value of Money u The Interest Rate u Simple Interest u Compound Interest u Amortizing a Loan u Compounding More Than Once per Year u The Interest Rate u Simple Interest u Compound Interest u Amortizing a Loan u Compounding More Than Once per Year

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3-4 $10,000 today Obviously, $10,000 today. TIME VALUE TO MONEY You already recognize that there is TIME VALUE TO MONEY!! The Interest Rate $10,000 today $10,000 in 5 years Which would you prefer -- $10,000 today or $10,000 in 5 years?

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3-5 TIME INTEREST TIME allows you the opportunity to postpone consumption and earn INTEREST. Why TIME? TIME Why is TIME such an important element in your decision?

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3-6 Types of Interest u Compound Interest Interest paid (earned) on any previous interest earned, as well as on the principal borrowed (lent). u Simple Interest Interest paid (earned) on only the original amount, or principal, borrowed (lent).

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3-7 Simple Interest Formula Formula FormulaSI = P 0 (i)(n) SI:Simple Interest P 0 :Deposit today (t=0) i:Interest Rate per Period n:Number of Time Periods

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3-8 $140 u SI = P 0 (i)(n) = $1,000(.07)(2) = $140 Simple Interest Example u Assume that you deposit $1,000 in an account earning 7% simple interest for 2 years. What is the accumulated interest at the end of the 2nd year?

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3-9 FV $1,140 FV = P 0 + SI = $1,000 + $140 = $1,140 u Future Value u Future Value is the value at some future time of a present amount of money, or a series of payments, evaluated at a given interest rate. Simple Interest (FV) Future Value FV u What is the Future Value (FV) of the deposit?

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3-10 The Present Value is simply the $1,000 you originally deposited. That is the value today! u Present Value u Present Value is the current value of a future amount of money, or a series of payments, evaluated at a given interest rate. Simple Interest (PV) Present Value PV u What is the Present Value (PV) of the previous problem?

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3-11 Why Compound Interest? Future Value (U.S. Dollars)

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3-12 $1,000 2 years Assume that you deposit $1,000 at a compound interest rate of 7% for 2 years. Future Value Single Deposit (Graphic) 2 0 1 2 $1,000 FV 2 7%

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3-13 FV 1 P 0 $1,000 $1,070 FV 1 = P 0 (1+i) 1 = $1,000 (1.07) = $1,070 Compound Interest You earned $70 interest on your $1,000 deposit over the first year. This is the same amount of interest you would earn under simple interest. Future Value Single Deposit (Formula)

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3-14 FV 1 P 0 $1,000 $1,070 FV 1 = P 0 (1+i) 1 = $1,000 (1.07) = $1,070 FV 2 P 0 $1,000 P 0 $1,000 $1,144.90 FV 2 = FV 1 (1+i) 1 = P 0 (1+i)(1+i) = $1,000(1.07)(1.07) = P 0 (1+i) 2 = $1,000(1.07) 2 = $1,144.90 $4.90 You earned an EXTRA $4.90 in Year 2 with compound over simple interest. Future Value Single Deposit (Formula) Future Value Single Deposit (Formula)

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3-15 FV 1 FV 1 = P 0 (1+i) 1 FV 2 FV 2 = P 0 (1+i) 2 Future Value General Future Value Formula: FV n FV n = P 0 (1+i) n FV n FVIFSee Table I or FV n = P 0 (FVIF i,n ) -- See Table I General Future Value Formula etc.

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3-16 FVIF FVIF i,n is found on Table I at the end of the book. Valuation Using Table I

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3-17 FV 2 FVIF $1,145 FV 2 = $1,000 (FVIF 7%,2 ) = $1,000 (1.145) = $1,145 [Due to Rounding] Using Future Value Tables

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3-18 $10,000 5 years Julie Miller wants to know how large her deposit of $10,000 today will become at a compound annual interest rate of 10% for 5 years. Story Problem Example 5 0 1 2 3 4 5 $10,000 FV 5 10%

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3-19 FV 5 FVIF $16,110 u Calculation based on Table I: FV 5 = $10,000 (FVIF 10%, 5 ) = $10,000 (1.611) = $16,110 [Due to Rounding] Story Problem Solution FV n FV 5 $16,105.10 u Calculation based on general formula: FV n = P 0 (1+i) n FV 5 = $10,000 (1+ 0.10) 5 = $16,105.10

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3-20 The result indicates that a $10,000 investment that earns 10% annually for 5 years will result in a future value of $16,105.10. Solving the FV Problem NI/YPVPMTFV Inputs Compute 5 10 -10,000 0 16,105.10

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3-21 “Rule-of-72”. We will use the “Rule-of-72”. Double Your Money!!! Quick! How long does it take to double $5,000 at a compound rate of 12% per year (approx.)?

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3-22 72 Approx. Years to Double = 72 / i% 726 Years 72 / 12% = 6 Years [Actual Time is 6.12 Years] The “Rule-of-72” Quick! How long does it take to double $5,000 at a compound rate of 12% per year (approx.)?

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3-23 The result indicates that a $1,000 investment that earns 12% annually will double to $2,000 in 6.12 years. Note: 72/12% = approx. 6 years Solving the Period Problem NI/YPVPMTFV Inputs Compute 12 -1,000 0 +2,000 6.12 years

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3-24 $1,000 2 years. Assume that you need $1,000 in 2 years. Let’s examine the process to determine how much you need to deposit today at a discount rate of 7% compounded annually. 2 0 1 2 $1,000 7% PV 1 PV 0 Present Value Single Deposit (Graphic)

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3-25 PV 0 FV 2 $1,000 FV 2 $873.44 PV 0 = FV 2 / (1+i) 2 = $1,000 / (1.07) 2 = FV 2 / (1+i) 2 = $873.44 Present Value Single Deposit (Formula) 2 0 1 2 $1,000 7% PV 0

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3-26 PV 0 FV 1 PV 0 = FV 1 / (1+i) 1 PV 0 FV 2 PV 0 = FV 2 / (1+i) 2 Present Value General Present Value Formula: PV 0 FV n PV 0 = FV n / (1+i) n PV 0 FV n PVIFSee Table II or PV 0 = FV n (PVIF i,n ) -- See Table II General Present Value Formula etc.

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3-27 PVIF PVIF i,n is found on Table II at the end of the book. Valuation Using Table II

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3-28 PV 2 $1,000 $1,000 $873 PV 2 = $1,000 (PVIF 7%,2 ) = $1,000 (.873) = $873 [Due to Rounding] Using Present Value Tables

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3-29 N:2 Periods (enter as 2) I/Y:7% interest rate per period (enter as 7 NOT.07) PV:Compute (Resulting answer is negative “deposit”) PMT:Not relevant in this situation (enter as 0) FV:$1,000 (enter as positive as you “receive $”) Solving the PV Problem NI/YPVPMTFV Inputs Compute 2 7 0 +1,000 -873.44

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3-30 $10,0005 years Julie Miller wants to know how large of a deposit to make so that the money will grow to $10,000 in 5 years at a discount rate of 10%. Story Problem Example 5 0 1 2 3 4 5 $10,000 PV 0 10%

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3-31 PV 0 FV n PV 0 $10,000 $6,209.21 u Calculation based on general formula: PV 0 = FV n / (1+i) n PV 0 = $10,000 / (1+ 0.10) 5 = $6,209.21 PV 0 $10,000PVIF $10,000 $6,210.00 u Calculation based on Table I: PV 0 = $10,000 (PVIF 10%, 5 ) = $10,000 (.621) = $6,210.00 [Due to Rounding] Story Problem Solution

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3-32 Solving the PV Problem NI/YPVPMTFV Inputs Compute 5 10 0 +10,000 -6,209.21 The result indicates that a $10,000 future value that will earn 10% annually for 5 years requires a $6,209.21 deposit today (present value).

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3-33 Types of Annuities u Ordinary Annuity u Ordinary Annuity: Payments or receipts occur at the end of each period. u Annuity Due u Annuity Due: Payments or receipts occur at the beginning of each period. u An Annuity u An Annuity represents a series of equal payments (or receipts) occurring over a specified number of equidistant periods.

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3-34 Examples of Annuities u Student Loan Payments u Car Loan Payments u Insurance Premiums u Mortgage Payments u Retirement Savings

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3-35 Parts of an Annuity 0 1 2 3 $100 $100 $100 (Ordinary Annuity) End End of Period 1 End End of Period 2 Today Equal Equal Cash Flows Each 1 Period Apart End End of Period 3

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3-36 Parts of an Annuity 0 1 2 3 $100 $100 $100 (Annuity Due) Beginning Beginning of Period 1 Beginning Beginning of Period 2 Today Equal Equal Cash Flows Each 1 Period Apart Beginning Beginning of Period 3

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3-37 FVA n FVA n = R(1+i) n-1 + R(1+i) n-2 +... + R(1+i) 1 + R(1+i) 0 Overview of an Ordinary Annuity -- FVA R R R n 0 1 2 n n+1 FVA n R = Periodic Cash Flow Cash flows occur at the end of the period i%...

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3-38 FVA 3 FVA 3 = $1,000(1.07) 2 + $1,000(1.07) 1 + $1,000(1.07) 0 $3,215 = $1,145 + $1,070 + $1,000 = $3,215 Example of an Ordinary Annuity -- FVA $1,000 $1,000 $1,000 3 0 1 2 3 4 $3,215 = FVA 3 7% $1,070 $1,145 Cash flows occur at the end of the period

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3-39 Hint on Annuity Valuation end beginning The future value of an ordinary annuity can be viewed as occurring at the end of the last cash flow period, whereas the future value of an annuity due can be viewed as occurring at the beginning of the last cash flow period.

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3-40 FVA n FVA 3 $3,215 FVA n = R (FVIFA i%,n ) FVA 3 = $1,000 (FVIFA 7%,3 ) = $1,000 (3.215) = $3,215 Valuation Using Table III

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3-41 N:3 Periods (enter as 3 year-end deposits) I/Y:7% interest rate per period (enter as 7 NOT.07) PV:Not relevant in this situation (no beg value) PMT:$1,000 (negative as you deposit annually) FV:Compute (Resulting answer is positive) Solving the FVA Problem NI/YPVPMTFV Inputs Compute 3 7 0 -1,000 3,214.90

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3-42 FVAD n FVA n FVAD n = R(1+i) n + R(1+i) n-1 +... + R(1+i) 2 + R(1+i) 1 = FVA n (1+i) Overview View of an Annuity Due -- FVAD R R R R R n-1 0 1 2 3 n-1 n FVAD n i%... Cash flows occur at the beginning of the period

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3-43 FVAD 3 FVAD 3 = $1,000(1.07) 3 + $1,000(1.07) 2 + $1,000(1.07) 1 $3,440 = $1,225 + $1,145 + $1,070 = $3,440 Example of an Annuity Due -- FVAD $1,000 $1,000 $1,000 $1,070 3 0 1 2 3 4 $3,440 = FVAD 3 7% $1,225 $1,145 Cash flows occur at the beginning of the period

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3-44 FVAD n FVAD n = R (FVIFA i%,n )(1+i) FVAD 3 $3,440 FVAD 3 = $1,000 (FVIFA 7%,3 )(1.07) = $1,000 (3.215)(1.07) = $3,440 Valuation Using Table III

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3-45 Solving the FVAD Problem NI/YPVPMTFV Inputs Compute 3 7 0 -1,000 3,439.94 Complete the problem the same as an “ordinary annuity” problem, except you must change the calculator setting to “BGN” first. Don’t forget to change back! Step 1:Press2 nd BGNkeys Step 2:Press2 nd SETkeys Step 3:Press2 nd QUITkeys

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3-46 PVA n PVA n = R/(1+i) 1 + R/(1+i) 2 +... + R/(1+i) n Overview of an Ordinary Annuity -- PVA R R R n 0 1 2 n n+1 PVA n R = Periodic Cash Flow i%... Cash flows occur at the end of the period

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3-47 PVA 3 PVA 3 = $1,000/(1.07) 1 + $1,000/(1.07) 2 + $1,000/(1.07) 3 $2,624.32 = $934.58 + $873.44 + $816.30 = $2,624.32 Example of an Ordinary Annuity -- PVA $1,000 $1,000 $1,000 3 0 1 2 3 4 $2,624.32 = PVA 3 7% $934.58 $873.44 $816.30 Cash flows occur at the end of the period

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3-48 Hint on Annuity Valuation beginning end The present value of an ordinary annuity can be viewed as occurring at the beginning of the first cash flow period, whereas the future value of an annuity due can be viewed as occurring at the end of the first cash flow period.

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3-49 PVA n PVA 3 $2,624 PVA n = R (PVIFA i%,n ) PVA 3 = $1,000 (PVIFA 7%,3 ) = $1,000 (2.624) = $2,624 Valuation Using Table IV

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3-50 N:3 Periods (enter as 3 year-end deposits) I/Y:7% interest rate per period (enter as 7 NOT.07) PV:Compute (Resulting answer is positive) PMT:$1,000 (negative as you deposit annually) FV:Not relevant in this situation (no ending value) Solving the PVA Problem NI/YPVPMTFV Inputs Compute 3 7 -1,000 0 2,624.32

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3-51 PVAD n PVA n PVAD n = R/(1+i) 0 + R/(1+i) 1 +... + R/(1+i) n-1 = PVA n (1+i) Overview of an Annuity Due -- PVAD R R R R n-1 0 1 2 n-1 n PVAD n R: Periodic Cash Flow i%... Cash flows occur at the beginning of the period

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3-52 PVAD n $2,808.02 PVAD n = $1,000/(1.07) 0 + $1,000/(1.07) 1 + $1,000/(1.07) 2 = $2,808.02 Example of an Annuity Due -- PVAD $1,000.00 $1,000 $1,000 3 0 1 2 3 4 $2,808.02 PVAD n $2,808.02 = PVAD n 7% $ 934.58 $ 873.44 Cash flows occur at the beginning of the period

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3-53 PVAD n PVAD n = R (PVIFA i%,n )(1+i) PVAD 3 $2,808 PVAD 3 = $1,000 (PVIFA 7%,3 )(1.07) = $1,000 (2.624)(1.07) = $2,808 Valuation Using Table IV

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