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: 31


The percent of change is -12.5%, so it is a percent decrease.

Work Step by Step

At the beginning, the client weighted 320 pounds. At the end, the client weighted 280 pounds. To find the percent change, we use this formula. Percent of change = $\frac{New\ amount\ -\ Original\ amount}{Original\ amount}$ $\times$ 100% Percent of change =$\frac{280\ -\ 320}{320}$ $\times$ 100% Percent of change = $\frac{-40}{320}$ $\times$ 100% -0.125 $\times$ 100 = -12.5%
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