Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 1 - Section 1.14 - Rate, Base, and Part - Exercises - Page 84: 29



Work Step by Step

$percent\ decrease=\frac{the\ change}{original\ amount}\times100\%$ Plug the given values into the formula and simplify. $decrease=\frac{2400-1920}{2400}\times100\%=\frac{480}{2400}\times100\%=0.2\times100\%=20\%$
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