Solve the Formula $i = p r t$ For the Variable R

Multiple Choice

Solve the formula $i = p r t$ for the variable r . Then substitute numbers i = 90 , p = 200, and t = 5 to find the variable's value.

A) r = 105
B) r = - 115
C) r = 0.09
D) r = 295
E) r = 0.45