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Objective [8.5a] Solve applied problems involving sales tax and percent. Brief Procedure Keep these facts in mind: Sales tax = Sales tax rate × Purchase price Total price = Purchase price + Sales tax Example The sales tax rate in Indiana is 5%. How much tax is charged on a bread machine costing $150? What is the total price? The sales tax is Sales tax rate × Purchase price 5% × $150, Practice Exercise 12. The sales tax rate in Connecticut is 8%. What is the total price of a digital camera that sells for $550? A. $44 B. $575 C. $594 D. $615

or 0.05 × 150, or 7.5. Thus, the sales tax is $7.50. The total price is the purchase price plus the sales tax: $150 + $7.50, or $157.50. Objective [8.5b] Solve applied problems involving commission and percent. Brief Procedure Keep this fact in mind: Commission = Commission rate × Sales Example Celina earns a commission of $1750 selling $25,000 worth of office equipment. What is the commission rate? Practice Exercise

13. Frank's commission rate is 12%. He receives a commission of $180 on the sale of sporting goods. How much did the CommisCommission = × Sales sporting goods cost? sion rate A. $1320 1750 = r × 25, 000 B. $1500 To solve this equation we divide by C. $4750 25,000 on both sides. D. $6500 1750 25, 000 250 · 7 250 · 100 250 7 · 250 100 7 100 7% = r · 25, 000 25, 000

=r =r =r =r

The commission rate is 7%.

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2000 Addison Wesley Longman

Objective [8.5c] Solve applied problems involving discount and percent. Brief Procedure Keep these facts in mind: Discount = Rate of discount × Original price Sale price = Original price - Discount Example A shirt marked $45 is on sale at 20% off. What is the discount? the sale price? Discount = D Rate of Original × discount price = 20% × 45 Practice Exercise 14. A sofa marked $650 is on sale at 30% off. What is the sale price? A. $195 B. $375 C. $455 D. $515

We convert 20% to decimal notation and multiply. 45 × 0. 2 9. 0 The discount is $9. Sale Original = - Discount price price S = 45 - 9 We subtract. - 45 9 36

The sale price is $36. Objective [8.6a] Solve applied problems involving simple interest and percent. Brief Procedure The simple interest I on principal P , invested for t years at interest rate r, is given by I = P · r · t. Example What is the interest on $4400 invested 1 at an interest rate of 8% for year? 2 Substitute $4400 for P , 8% for r, and 1 for t in the simple interest formula. 2 I = P ·r·t = $4400 × 8% × = $4400 × 0.08 2 = $176 1 year is $176. 2 1 2 Practice Exercise 15. What is the interest on $1200 1 invested at 6% for year? 4 A. $8 B. $18 C. $36 D. $72

The interest for

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2000 Addison Wesley Longman

Objective [8.6b] Solve applied problems involving compound interest. Brief Procedure If a principal P has been invested at interest rate r, compounded n times a year, in t years it will grow to an amount A given by A=P · 1+ r n

n·t

Example The Jensens invest $2000 in an account paying 12%, compounded semiannually. Find the amount in the ac1 count after 1 years. 2 Substitute $2000 for P , 12% for r, 2 3 1 for n, and 1 , or , for t in the com2 2 pound interest formula. A = P · 1+ r n

n·t

Practice Exercise 17. The Shaws invest $3600 in an account paying 8%, compounded quarterly. Find the amount in the account after 1 year. A. $3745.44 B. $3880.00 C. $3893.73 D. $3896.76

0.12 = $2000 × 1 + 2 = $2000 × (1 + 0.06)3 2382.03

2· 3 2

The amount in the account after 1 years is $2382.03.

1 2

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Chapter08cd

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