Answer
$r=\frac{S-a}{S}$
Work Step by Step
$S=\frac{a}{1-r}\\S(1-r)=a\\S-Sr=a\\-Sr=a-S\\r=\frac{S-a}{S}$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 6 - Section 6.7 - Formulas and Applications of Rational Equations - Exercise Set - Page 475: 6
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