90 SMC 75 D 60 45 30 15 q 0 350 1050 1750 The graph shows demand and marginal cost for a perfectly competitive firm. If the firm is producing 700 units of output, increasing output by one unit would the firm's profit by $ If the firm is producing 1750 units of output, increasing output by one unit would the firm's profit by $Firm A and firm B both have total revenues of $470 000 and total costs of $640 000. Firm A has total fixed costs of $210 000, while firm B has total fixed costs of $130 000. Which of the following statements are true in the short run? Select all that applies: O I. Firm A should operate. Il. Firm 8 should operate. Ill. Firm A should shut down. O IV. Firm 5 should shut down