Solve the Problem $$p = - \frac { 1 } { 4 } x + 120 , \quad 0 \leq x \leq 480$$

Multiple Choice

Solve the problem.
-The price p and the quantity x sold of a certain product obey the demand equation $$p = - \frac { 1 } { 4 } x + 120 , \quad 0 \leq x \leq 480$$ What price should the company charge to maximize revenue?

A) $72
B) $90
C) $60
D) $30