Answer
55
Work Step by Step
We call c the number of commissions he makes:
$$ 960 = 300 + 12 c \\ 660 = 12c \\ c = 55$$
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 3 - Equations and Problem Solving - 3.3 - More on Solving Equations and Problem Solving - Problem Set 3.3 - Page 115: 58
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