Answer
10
Work Step by Step
percent * base = amount
$78\%\times x=7.8$
$0.78\times x=7.8$
$0.78x\div0.78=7.8\div0.78$
$x=10$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 7 - Section 7.3 - Solving Percent Problems with Proportions - Exercise Set - Page 492: 19
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