Answer
The markup is \$5.
Work Step by Step
$P=C+M$
$12=7+M$
$12-7=7+M-7$
$5=M$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 3 - Section 3.4 - Linear Equations in One Variable and Problem Solving - Exercise Set - Page 199: 60
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