# Chapter 3 - Equations and Problem Solving - 3.2 - Equations and Problem Solving - Problem Set 3.2: 47

t = $\frac{A}{Pr}$ - $\frac{1}{r}$

#### Work Step by Step

Using the properties of equality we obtain: $A = P + Prt$ Subtract P from both sides $A - P = Prt$ Divide both sides by Pr $\frac{A}{Pr}$ - $\frac{P}{Pr}$ = $\frac{Prt}{Pr}$ $\frac{A}{Pr}$ - $\frac{1}{r}$ = t

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