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: 38

Answer

The percent of change in the patient’s dosage is -25%. The dosage amount decreased by 25%.

Work Step by Step

To find the percentage change, we use the following formula: percentage change = $\frac{New\ amount\ -\ Original\ amount}{Original\ amount}$ $\times$ 100% The original dosage was 40 milligrams. The new dosage is 30 milligrams. We substitute these values into the formula to obtain: percentage change = $\frac{30\ -\ 40}{40}$ $\times$ 100% percentage change = $\frac{-10}{40}$ $\times$ 100% percentage change = -0.25 $\times$ 100% percentage change = -25% Because it is a negative number, it is a percent decrease.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.