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. Consider a market with two identical firms: Firm A and Firm B. . The market demand is P = 27 - 2 Q, where Q = qA + qB. . Firms' cost structure is such that MCA = MCB = ACA = ACB = 3 (a) Write the expression for market demand in terms of Firm A's and Firm B's output levels. P(qA, qB) (b) Write the expression for Firm A's marginal revenue function in terms of Firm A's and Firm B's output levels. MRA(QA, QB) = (Write the function in its simplest form.)