Solve the Problem $F ( x ) = ( P + I ) ( x )$

Multiple Choice

Solve the problem.
-Suppose that P(x) represents the percentage of income spent on food in year x and I(x) represents income in year x. Determine a function F that represents total food expenditures in year x. A) $F ( x ) = ( P + I ) ( x )$
B) $F ( x ) = ( P \cdot I ) ( x )$
C) $F ( x ) = ( I - P ) ( x )$
D) $F ( x ) = \left( \frac { I } { P } \right) ( x )$