Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 2 - Section 2.4 - Formulas and Percents - Exercise Set - Page 152: 21


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

Work Step by Step

To solve the equation for $r$, we must isolate $r$. We first subtract $P$ from each side: $$S - P = Prt$$ We can then divide by both $P$ and $t$ together to get: $$r = \frac{S - P}{Pt}$$
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