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: 37


The percentage change in the patient’s daily dosage is +20%, so this is a percent increase.

Work Step by Step

To find the percentage change, we use the following formula: Percent of change = $\frac{New\ amount\ -\ Original\ amount}{Original\ amount}$ $\times$ 100% The original amount is 500, and the new amount is 600. We substitute these values into the formula to obtain : percentage change = $\frac{600\ -\ 500}{500}$ $\times$ 100% percentage change = $\frac{100}{500}$ $\times$ 100% percentage change = 0.2 $\times$ 100% percentage change = 20%
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