Solve the Equation for the Specified Variable $\mathrm { r } = \frac { \mathrm { P } - \mathrm { A } } { \mathrm { Pt } }$

Multiple Choice

Solve the equation for the specified variable.
-A=P(1+r t) for r

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