Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 6 - Percent - 6.4 Using Proportions to Solve Percent Problems - 6.4 Exercises: 25


550 students

Work Step by Step

Use percent proportion. $\frac{495}{x}=\frac{90}{100}$ or $\frac{495}{x}=\frac{9}{10}$ Cross products: $9x=4950$ Divide by 9: $x=550$
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