## Elementary Algebra

Published by Cengage Learning

# Chapter 4 - Proportions, Percents, and Solving Inequalities - 4.2 - Percents and Problem Solving - Problem Set 4.2 - Page 155: 35

#### Answer

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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