Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 8 - Personal Finance - 8.1 Percent, Sales Tax and Discounts - Exercise Set 8.1 - Page 496: 68


The statement does not make sense.

Work Step by Step

The statement does not make sense. Let $I$ be the person's income. The rent increased from $0.2I$ to $0.3I$. The increase in rent is $0.1I$. We can express this increase as a percent. $\frac{increase}{original~rent} = \frac{0.1I}{0.2I} = 0.5 = 50\%$ The percent increase is 50%
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