If P Dollars Are Invested at an Annual Rate of R

Multiple Choice

If P dollars are invested at an annual rate of r%, then in t years this investment grows to F dollars, where $F = P \left( 1 + \frac { r } { 100 } \right) ^ { t }$ .If you solve this equation for P and hold F and r constant, what will the sign of $\frac { d P } { d t }$ be?

A) positive
B) negative