18. Patrick purchased four new tires that were regularly priced at $94.99 each, but are on sale for $20 off per tire. If the sales tax rate is 6%, how much will be charged to Patrick’s VISA card? 144 Chapter 2 Linear Equations and Inequalities Concept 1: Basic Percent Equations For Exercises 5–16, find the missing values. 5. 45 is what percent of 360? 6. 338 is what percent of 520? 7. 544 is what percent of 640? 8. 576 is what percent of 800? 9. What is 0.5% of 150? 10. What is 9.5% of 616? 11. What is 142% of 740? 12. What is 156% of 280? 13. 177 is 20% of what number? 14. 126 is 15% of what number? 15. 275 is 12.5% of what number? 16. 594 is 45% of what number? 17. A Craftsman drill is on sale for $99.99. If the sales tax rate is 7%, how much will Molly have to pay for the drill? (See Example 1.) For Exercises 19–22, use the graph showing the distribution for leading forms of cancer in men. (Source: Centers for Disease Control) 19. If there are 700,000 cases of cancer in men in the United States, approximately how many are prostate cancer? 20. Approximately how many cases of lung cancer would be expected in 700,000 cancer cases among men in the United States? 21. There were 14,000 cases of cancer of the pancreas diagnosed out of 700,000 cancer cases.What percent is this? (See Example 2.) Percent of Cancer Cases by Type (Men) Bladder 6% 22. There were 21,000 cases of leukemia diagnosed out of 700,000 cancer cases.What percent is this? Lung Colon 13% 11% All other sites 33% Melanoma 4% Prostate 33% 23. Javon is in a 28% tax bracket for his federal income tax. If the amount of money that he paid for federal income tax was $23,520, what was his taxable income? (See Example 3.) Concept 2: Applications Involving Simple Interest 24. In a recent survey of college-educated adults, 155 indicated that they regularly work more than 50 hr a week. If this represents 31% of those surveyed, how many people were in the survey? 25. Aidan is trying to save money and has $1800 to set aside in some type of savings account. He checked his bank one day, and found that the rate for a 12-month CD had an annual percentage yield (APY) of 4.25%. The interest rate on his savings account was 2.75% APY. How much more simple interest would Aidan earn if he invested in a CD for 12 months rather than leaving the $1800 in a regular savings account? 26. How much interest will Roxanne have to pay if she borrows $2000 for 2 years at a simple interest rate of 4%? 27. Bob borrowed money for 1 year at 5% simple interest. If he had to pay back a total of $1260, how much did he originally borrow? (See Example 4.) 28. Andrea borrowed some money for 2 years at 6% simple interest. If she had to pay back a total of $3640, how much did she originally borrow?
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