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Holt Algebra 1 2-9 Application of Percents 2-9 Applications of Percents Holt Algebra 1 Lesson Quiz Lesson Quiz Lesson Presentation Lesson Presentation.

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Presentation on theme: "Holt Algebra 1 2-9 Application of Percents 2-9 Applications of Percents Holt Algebra 1 Lesson Quiz Lesson Quiz Lesson Presentation Lesson Presentation."— Presentation transcript:

1 Holt Algebra Application of Percents 2-9 Applications of Percents Holt Algebra 1 Lesson Quiz Lesson Quiz Lesson Presentation Lesson Presentation Warm Up Warm Up

2 Holt Algebra Application of Percents Warm Up 1. Write 0.03 as a percent. 2. Write as a decimal. Find each value. Round to the nearest tenth if necessary. 3. Find 10% of 53. Solve for x = (x) (20) 4. Find of = (36) (x) 3%

3 Holt Algebra Application of Percents Use common applications of percents. Estimate with percents. Objectives

4 Holt Algebra Application of Percents commission interest sales tax Principle tip Vocabulary

5 Holt Algebra Application of Percents A commission is money paid to a person or a company for making a sale. Usually the commission is a percent of the sale amount.

6 Holt Algebra Application of Percents Caution! You must convert a percent to a decimal or a fraction before doing any calculations with it.

7 Holt Algebra Application of Percents Example 1: Business Application Mr. Cortez earns a base salary of $26,000 plus a sales commission of 5%. His total sales for one year were $300,000. Find his total pay for the year. Write the formula for total pay. total pay = base salary + commission Write the formula for commission. Substitute values given in the problem. = 26, % of 300,000 = base + % of total sales Write the percent as a decimal. = 26,000 + (0.05)(300,000) Multiply.= 26, ,000 Add.= 41,000 Mr. Cortezs total pay was $41,000.

8 Holt Algebra Application of Percents Write the formula for total pay. total pay = base salary + commission Write the formula for commission. Substitute values given in the problem. = % of 940 = base + % of total sales Write the percent as a decimal. = (0.12)(940) Multiply.= Add.= The telemarketers total pay was $ A telemarketer earns $350 per week plus 12% commission on sales. Find her total pay for a week in which her sales were $940. Check It Out! Example 1

9 Holt Algebra Application of Percents Interest is the amount of money charged for borrowing money, or the amount of money earned when saving or investing money. Principle is the amount borrowed or invested. Simple interest is interest paid only on the principle. Simple Interest Paid Annually Time in years Interest rate per year as a decimal Principle Simple interest

10 Holt Algebra Application of Percents Example 2A: Financial Application Find the simple interest paid for 3 years on a $2500 loan at 11.5% per year. I = Prt Write the formula for simple interest. I = (2500)(0.115)(3) Substitute known values. Write the interest rate as a decimal. I = The amount of interest is $ Multiply.

11 Holt Algebra Application of Percents Example 2B: Financial Application After 6 months, the simple interest earned on an investment of $5000 was $45. Find the interest rate. I = Prt Write the formula for simple interest. 45 = 2500r = r The interest rate is 1.8%. Substitute the given values. Multiply Since r is multiplied by 2500, divide both sides by 2500 to undo the multiplication.

12 Holt Algebra Application of Percents Helpful Hint When you are using the formula I= Prt to find simple interest paid annually, t represents time in years. One month is year.

13 Holt Algebra Application of Percents Check It Out! Example 2a Find the simple interest earned after 2 years on an investment of $3000 at 4.5% interest earned annually. I = Prt Write the formula for simple interest. I = 270 The interest earned is $270. Substitute the given values. Multiply. I = (3000)(0.045)(2)

14 Holt Algebra Application of Percents Check It Out! Example 2b The simple interest paid on a loan after 6 months was $306. The annual interest rate was 8%. Find the principle. I = Prt Write the formula for simple interest. The remaining principle is $7650. Substitute the given values. 306 = (P)(0.08) 306 =.04P 7650 = P Multiply Since P is multiplied by 0.04, divide both sides by 0.04.

15 Holt Algebra Application of Percents A tip is an amount of money added to a bill for service. it is usually a percent of the bill before sales tax is added. Sales tax is a percent of an items cost.

16 Holt Algebra Application of Percents Sales tax and tips are sometimes estimated instead of calculated exactly. When estimating percents, use percents that you can calculate mentally. Find 10% of a number by moving the decimal point one place to the left. Find 1% of a number by moving the decimal point two places to the left. Find 5% of a number by finding of 10% of the number.

17 Holt Algebra Application of Percents Example 3A: Estimating with Percents Lunch at a restaurant is $ Estimate a 15% tip. Step 1 First round $27.88 to $30. Step 2 Think: 15% = 10% + 5% 10% of $30 = $3.00 Step 3 Think 5% = 10% ÷ 2 = $3.00 ÷ 2 = $1.50 Step 4 15 = 10% + 5% = $ $1.50 = $4.50 The tip should be about $4.50. Move the decimal point one place left.

18 Holt Algebra Application of Percents Example 3B: Estimating with Percents The sales tax rate is 7.25%. Estimate the sales tax on a book that costs $ Step 1 First round 7.25% to 7% and $19.97 to $20. Step 2 Think: 7% = 7(1%) 1% of $20 =$0.20 Step 3 7% = 7(1%) = 7($0.20) = $1.40 The sales tax is about $1.40. Move the decimal point two places left.

19 Holt Algebra Application of Percents Helpful Hint A 6.25% sales tax rate means that for every $100 you spend, you would pay $6.25 in sales tax.

20 Holt Algebra Application of Percents Check It Out! Example 3a Estimate a 15% tip on a check for $ Step 1 Think: 15% = 10% + 5% 10% of $22 = $2.20 Step 2 Think 5% = 10% ÷ 2 $2.20 ÷ 2 = $1.10 Step 3 15% = 10% +5% = $ $1.10 = $3.30 The tip should be about $3.30. Move the decimal point one place left.

21 Holt Algebra Application of Percents Estimate the tax on shoes that cost $68.50 when the sales tax rate is 8.25%. Step 1 First round 8.25% to 8% and $68.50 to $70. Step 2 Think: 8% = 8(1%) 1% of $70 =$0.70 Step 3 8% = 8(1%) = 8($0.70) = $5.60 The sales tax is about $5.60. Check It Out! Example 3b Move the decimal point two places left.

22 Holt Algebra Application of Percents Lesson Quiz: Part 1 1. A computer salesperson earns a base salary of $32,000 per year plus a commission of 6% on total sales. Total sales for one year were $350,000. Find the salespersons total pay for the year. $53, Find the simple interest paid for 9 months on a a $500 loan at 8% per year. $30 3. After 2 years the simple interest earned on an investment of 4000 was $216. Find the interest rate. 2.7%

23 Holt Algebra Application of Percents Lesson Quiz: Part 2 4. A familys dinner check was $ Estimate a 15% tip. About $ The sales tax rate is 7.1%. Estimate the sales tax on a television set that costs $399. About $28


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