Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 4 - Proportions, Percents, and Solving Inequalities - 4.2 - Percents and Problem Solving - Problem Set 4.2 - Page 155: 32


The percentage of change in the number of phones sold between May and June is +24%, so it is a percent increase.

Work Step by Step

The cell phone store sold 200 phones in May and 248 phones in June. To find the percentage of change, we use the following formula: Percent of change = $\frac{New\ amount\ -\ Original\ amount}{Original\ amount}$ $\times$ 100% The new amount is 248, and the original amount is 200. We substitute these values into the equation to obtain: Percentage change = $\frac{248 - 200}{200}$ $\times$ 100% Percentage change = $\frac{48}{200}$ $\times$ 100% Percentage change = 0.24 $\times$ 100% Percentage change = 24%
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