Answer
31.2 hours can be billed.
Work Step by Step
percent * base = amount
$78\%\times 40=b$
$0.78\times40=b$
$31.20=b$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 7 - Section 7.4 - Applications of Percent - Exercise Set - Page 504: 27
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