Fundamentals of Mathematics, 2008a

464 CHAPTER 7. RATIOS AND RATES
7.9.1.5 Applications of Percents (Section 7.7)
For problems 65-72, nd each solution.
Exercise 7.9.65 (Solution on p. 474.)
What is 16% of 40?
Exercise 7.9.66
29.4 is what percent of 105?
Exercise 7.9.67 (Solution on p. 474.)
is 547.2% of what number?
3 21
50
Exercise 7.9.68
0.09378 is what percent of 52.1?
Exercise 7.9.69 (Solution on p. 474.)
What is 680% of 1.41?
Exercise 7.9.70
A kitchen knife is on sale for 15% o the marked price. If the marked price is $ 39.50, what is the
sale price?
Exercise 7.9.71 (Solution on p. 474.)
On an 80 question geology exam, a student gets 68 correct. What percent is correct?
Exercise 7.9.72
A salesperson makes a commission of 18% of her monthly sales total. She also receives a monthly
salary of $1,600.00. If, in a particular month, she sells $4,000.00 worth of merchandise, how much
will she make that month?
7.10 Prociency Exam 10
7.10.1 Prociency Exam
Exercise 7.10.1 (Solution on p. 474.)
(Section 7.2) Compare 4 cassette tapes to 7 dollars.
Exercise 7.10.2 (Solution on p. 474.)
(Section 7.2) What do we call a comparison, by division, of two unlike denominate numbers?
For problems 3 and 4, express each ratio or rate as a fraction.
Exercise 7.10.3 (Solution on p. 474.)
(Section 7.2) 11 to 9
Exercise 7.10.4 (Solution on p. 474.)
(Section 7.2) 5 televisions to 2 radios
For problems 5 and 6, write each ratio or rate in the form "a to b."
Exercise 7.10.5 (Solution on p. 474.)
(Section 7.2) 8 maps
3 people
Exercise 7.10.6 (Solution on p. 474.)
(Section 7.2) 2 psychologists
75 people
For problems 7-9, solve each proportion.
Exercise 7.10.7 (Solution on p. 474.)
(Section 7.3) 8 x = 48
90
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