A Firm Produces a Product at a Fixed Marginal Cost

Multiple Choice

A firm produces a product at a fixed marginal cost of $10 and sells the product on two different markets (A and B) . The demand on market A is Q_A = 80 - 2P. The demand on market B is Q_B = 50 - P. What quantity should the firm sell on market A?

A) 20
B) 25
C) 30
D) None of the above is correct.