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 156: 54


The percent change in the price of a bushel of grain is 230%. It is a percent increase.

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 original price was 12.00 dollars a bushel. The new price became 39.60 dollars a bushel. Substituting these values into the formula yields percent change = $\frac{39.60\ -\ 12.00}{12.00}$ $\times$ 100% percent change = $\frac{27.60}{12.00}$ $\times$ 100% percent change = 2.3 $\times$ 100% percent change = 230% Because the percent change is a positive number, it is a percent increase.
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