Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 1 - Equations and Inequalities - 1.2 Applications and Modeling with Linear Equations - 1.2 Exercises - Page 100: 6


Option $D$

Work Step by Step

Let x = original price Note that $60\%=0.60$. A $60\%$ discount means 60 percent of the original price is deducted from the original price itself. Thus, in mathematical sentence, a 60-percent discount is represented by: $x-60\%x = x - 0.60x = 0.40x$ Since $0.4 = \dfrac{4}{10}$. then the discounted price is also equivalent to $\dfrac{4}{10}x$. Therefore, the one in Option D does not represent the discounted/sale price.
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