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Math 20 Homework
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Recommended Textbook Homework Not Turned In for Chapter 6

Remember the Reading Check problems for each section.

Section 6.1 # 1, 7, 13, 15, 19, 21, 22, 27, 35, 37, 45, 47, 69, 71, 73

Section 6.2 # 1, 3, 1, 15, 17, 19, 25, 27, 37, 39, 41, 43, 45, 47, 49, 55, 57, 59, 61, 73, 79, 81

Section 6.3 # 1, 3, 5, 7, 13, 15, 21, 25, 27, 31, 37, 39, 43

Section 6.4 # 1, 3, 5, 13, 15, 21, 25, 27, 29, 31, 35, 37, 43

Section 6.5 # 3, 5, 11, 23, 25, 27, 31, 37, 39

Section 6.6 # 1, 5, 9, 11, 19, 21, 23, 33, 35, 37, 39, 41, 51

Section 6.7 # 1, 3, 5, 9, 11, 35, 37

Also try the Translating for Success on page 374.

1. Write 5.5% as a decimal.

550 55 5.5 0.55 0.055

2. Write 0.8911 as a percent.

0.08911% 0.8911% 8.911% 89.11% 891.1% 8,911%

3.Write 0.8% as a fraction.

8/10 8/10 % 1/8 1/125

4. Write 25 3/8 % as a fraction.

25 3/8 203/8 203/100 203/800

5. Write the fraction 7/8 as a percent.

7/8 % 0.78% 0.875% 87.5%

6. Write the fraction 17/50 as a percent.

17/50 % 0.175% 0.34% 34%

7. After we change two-thirds into percent format, do its digits repeat endlessly?

yes no

8. Write 33 1/3 percent as a fraction.

33 1/3 100/3 1/3 3

9. $39 is what percent of $50?

12.8% 50% 78% 128%

10. 56.32 is 64% of what?

86 87 88 89

11. What percent of 160 is 150?

10% 93.75% 107% 110%

12. 80% of what is 16?

12.8 16 20 80

13. A student got 81.7 problems correct on a test (there was partial credit). This scored 86%. How many problems were on the test?

70 problems 75 problems 90 problems 95 problems 114 problems

14. A student scored 91% on a test with 40 problems. There was partial credit. How many problems did she get correct?

3.6 problems 27.5 problems 36.4 problems 44 problems 56 problems

15. An investment increases in value from $200 to $216. What is the percent increase?

8% 16% 32% 34.56%

16. During a sale, a dress decreasd in price from $90 to $72. What was the percent of decrease?

20% 80% 120% 125%

17. The sales tax on an item is $100. The sales tax rate is 5%. What is the purchase price (before tax)?

$5.00 $105 $500 $2,000

18. A salesman earns a 40% commission. One week he earns $552 in commission. How much did he sell?

$138.00 $220.80 $1,380 $22,080

19. A pinball machine that normall sells for $3,999 is on sale for $3,150. What is the rate of discount?

$849 21.2% 98.5% 101.6%

20. Find the simple interest for a 2 month loan of $8,000 at a simple interest rate of 9.42%.

$62.80 $125.60 $753.60 $1,507.20

21. A store takes out a ninety day loan for $6,500 at 5.25% simple interest. What is the total amount due after ninety days?

$84.14 $341.25 $6,584.14 $6,841.25

22. Bluebeard has a balance of $1,834.90 on a credit card with an annual percentage rate of 22.4%. This month's minimum payment is $36.70. How much less than this minimum payment is the interest? (In other words, if he only pays the minimum payment, how much goes "past" the interest to pay off his principal?)

$2.45 $3.74 $4.40 $32.59