Solve the Problem $p$ (In Dollars) and the Quantity $x$ Sold of a Certain Product Obey the Demand Equation

Multiple Choice

Solve the problem.
-The price $p$ (in dollars) and the quantity $x$ sold of a certain product obey the demand equation
$$p = - 10 x + 240 , \quad 0 \leq x \leq 24 \text {. }$$
What price should the company charge to maximize revenue?

A) \$6
B) $\$ 18$
C) $\$ 14.4$
D) $\$ 12$