Answer
${{\$}} 12$
Work Step by Step
Let x = dealer's cost.
Adding a markup of $ 25\%$ to $ 100\%$ of x, we have the final price :
$125\%$ of $ x $ = $1.25x $
Given that $\quad 1.25x=15$,
We divide with $1.25,$
$ x={{\$}} 12$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.8 - Modeling with Equations - Exercise Set - Page 123: 20
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