The graph below shows the demand curve (D), marginal revenue curve (MR), marginal cost curve (MC), average total cost curve (ATC), and long-run average total cost curve (LRATC) for a monopolist. PRICE $60 $50 $40 $35 $30 $20 MC = ATC = LRATC $10 D 2 4 5 0% 10 12 QUANTITY MR(e) Now assume that the monopolist produces 10 units. Using the numbers given in the graph, the monopolist's economic prot. Show your work. (d) At what quantity is demand unit elastic? E ll