Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10: 0134467795
ISBN 13: 978-0-13446-779-5

Chapter 6 - Percent - 6.4 Using Proportions to Solve Percent Problems - 6.4 Exercises - Page 419: 42


See below for a sample problem.

Work Step by Step

Example percent problem (many others are possible): Question: Jill bought shoes on sale (60% off) for $\$30$. How much did the shoes cost originally (before the sale)? Answer: We set up a proportion. Since the shoes were $60\%$ off, Jill paid $40\%$ of the original price of the shoes. $\frac{40}{100}=\frac{30}{x}$ We cross-multiply: $40x=30*100$ $40x=3000$ $x=3000/40=300/4=150/2=75$ Thus the original price of the shoes was $\$75$.
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