Answer
$r=\frac{S-P}{Pt}$
Work Step by Step
$S = P + Prt\\S-P=Prt\\r=\frac{S-P}{Pt}$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 6 - Algebra: Equations and Inequalities - 6.3 Applications of Linear Equations - Exercise Set 6.3 - Page 375: 55
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