Suppose in a Cournot Duopoly That Two Firms, Firm 1 $P = 50 -$

Suppose in a Cournot duopoly that two firms, Firm 1 and Firm 2, face market demand $P = 50 -$ $Q$ and both have marginal cost, $M C = \$ 20$ . The equilibrium output for each firm will be:

A) $Q _ { 1 } = Q _ { 2 } = 7.5$
B) $Q _ { 1 } = Q _ { 2 } = 10$
C) $Q _ { 1 } = Q _ { 2 } = 15$
D) $Q _ { 1 } = Q _ { 2 } = 20$