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3. A single firm has a monopoly in the market for doodads and can produce at constant average and marginal costs of C dollars per doodad. The firm faces the market demand curve given by Q = A- Bp, where A, B, and C are positive parameters such that A > BC. (a) Find the profit-maximizing quantity, price, and profit as functions of A, B, and C. (b) Use your part-(a) results to complete the following table: (A, B. C) Q P (60, 1, 10) (25, 0.5, 10) (80. 2, 10) (c) Use your part-(b) results to explain why a monopoly has no supply curve in the sense that perfectly competitive firms or industries do. (d) Plot the demand and cost curves given in the part-(b) table along with the associated profit-maximizing quantity-price pairs in the following graph after labelling appropriately the two axes. 20 50 70 80