Answer
20%
Work Step by Step
$percent\ decrease=\frac{the\ change}{original\ amount}\times100\%$
Plug the given values into the formula and simplify.
$decrease=\frac{2400-1920}{2400}\times100\%=\frac{480}{2400}\times100\%=0.2\times100\%=20\%$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
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
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