Answer
50% increase
Work Step by Step
In the denominator, the student plugs 18 in for the original amount instead of 12. The answer instead should be the following: $(\frac{18-12}{12})\times100=50$%
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 2 - Solving Equations - 2-10 Change Expressed as a Percent - Practice and Problem-Solving Exercises - Page 149: 37
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