Answer
The proportion is
$\frac{85}{100}=\frac{520}{x}$
Work Step by Step
A percent proportion is
$\frac{percent}{100}=\frac{amount}{base}$
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 491: 8
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