#### 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
$\frac{S-P}{Pt}=\frac{Prt}{Pt}$
$\frac{S-P}{Pt}=r$
$r=\frac{S-P}{Pt}$

Published by
Pearson

ISBN 10:
0-32178-228-3

ISBN 13:
978-0-32178-228-1

$r=\frac{S-P}{Pt}$

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.