Suppose a Firm's Profit Is Given by the Equation π $\pi$

Multiple Choice

Suppose a firm's profit is given by the equation π = -200 + 80Q - .2Q². Which of the following is true?

A) The firm's marginal profit is given by the equation: M $\pi$ = 80 - .2Q.
B) The firm's profit-maximizing output is Q = 400.
C) The firm's profit-maximizing output is Q = 200.
D) The firm's marginal profit is given by the equation: M $\pi$ = 80 - 2Q.
E) The firm's profit-maximizing output is Q = 800.