Practice and Problem-Solving Exercises

A Practice

See Problems 1 and 2.

Find each percent.

9. What percent of 75 is 15?
10. What percent of 15 is 75?
11. What percent of 16 is 10?
12. What percent of 32 is 40?
13. What percent of 48 is 20?
14. What percent of 88 is 88?

See Problem 3.

Find each part.

15. What is 25% of 144?
16. What is 63% of 150?
17. What is 12.5% of 104?
18. What is 150% of 63?
19. What is 125% of 12.8?
20. What is 1% of 1?
21. Shopping A tennis racket normally costs $65. The tennis racket is on sale for 20% off. What is the sale price of the tennis racket?
22. Hair Care A beauty salon buys bottles of styling gel for $4.50 per bottle and marks up the price by 40%. For what price does the salon sell each bottle?

See Problem 4.

Find each base.

23. 20% of what number is 80?
24. 80% of what number is 20?
25. 60% of what number is 13.5?
26. 160% of what number is 200?
27. 150% of what number is 34?
28. 1% of what number is 1?

    See Problem 5.

29. Finance You deposit $1200 in a savings account that earns simple interest at a rate of 3% per year. How much interest will you have earned after 3 years?
30. Finance You deposit $150 in a savings account that earns simple interest at a rate of 5.5% per year. How much interest will you have earned after 4 years?

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