If a firm wants to maximize her profit in the long-run, how many good will she produce, if the price is $15 in a competitive market? Q Revenue Variable Cost Total cost MR MC 1 $10 $20 $35 4 $53 5 $81 ONone of the choices O1 O2 05What is the marginal cost of producing the third good? Q Revenue Variable Cost Total cost MR MC 1 $10 2 $20 3 $35 4 $53 5 $81 O $1 O $7 O We need fixed cost to calculate it O $5 O$3