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: 35


The percentage change for the attendance between the two class periods is -12.5%, so it is a percent decrease.

Work Step by Step

The first time 32 students were in class. The second time, 28 students were in class. To find the percentage change, we use the following formula: percentage change = $\frac{New\ amount\ -\ Original\ amount}{Original\ amount}$ $\times$ 100% The original amount is 32, and the new amount is 28. We substitute these values into the formula to obtain: percentage change = $\frac{28\ -\ 32}{32}$ $\times$ 100% percentage change = $\frac{-4}{32}$ $\times$ 100% percentage change = -0.125 $\times$ 100% percentage change = -12.5%
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