Elementary Algebra

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

Chapter 4 - Proportions, Percents, and Solving Inequalities - Chapter 4 Review Problem Set: 36

Answer

The percent increase in the electric utility bill from July to August was 16.67%, or approximately 17%.

Work Step by Step

To find the percent change, we use the following formula: percent change = $\frac{New\ amount\ -\ Original\ amount}{Original\ amount}$ $\times$ 100% The bill in July was 120. The bill in August was 140. Substituting these values into the formula yields: percent change = $\frac{140-120}{120}$ $\times$ 100% percent change= $\frac{20}{120}$ $\times$ 100% percent change = 0.166666 $\times$ 100% $\approx$ 0.1667 $\times$ 100% percent change = 16.67% $\approx$ 17% The percent decrease in the electric utility bill from July to August was 16.67%, or approximately 17%.
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