Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 8 - Personal Finance - 8.1 Percent, Sales Tax and Discounts - Exercise Set 8.1 - Page 495: 9

Answer

11.25%

Work Step by Step

$\frac{9}{80}$ = $9\div80$ = 0.1125 0.1125 x 100 = 11.25%
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