Solve the Formula for the Specified Variable $P = \frac { A } { 1 + r t } \quad \text { for } r$

Multiple Choice

Solve the formula for the specified variable.
- $P = \frac { A } { 1 + r t } \quad \text { for } r$

A) $r = \frac { A - P } { P t }$
B) $r = P - A t$
C) $r = \frac { P - 1 } { A t }$
D) $\mathrm { r } = \frac { \mathrm { P } - \mathrm { A } } { 1 + \mathrm { t } }$