Answer
$r=\frac{S-P}{Pt}$
Work Step by Step
$S=P+Prt$
Solve for $r$
Add $-P$ to both sides.
$S-P=P+Prt-P$
$S-P=Prt$
Divide by $Pt$ both sides
$\frac{S-P}{Pt}=\frac{Prt}{Pt}$
$\frac{S-P}{Pt}=r$
$r=\frac{S-P}{Pt}$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 1 - Equations and Inequalities - Exercise Set 1.3 - Page 135: 67
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