Consider a monopolistic firm selling the same product in two separate markets, A and B, which have different demand curves. The demand in market A is defined by P_A = 18 - 2Q_A for positive prices and quantities (i.e., for all P_A, Q_A > 0) and the demand in market B is defined by P_B = 9 - Q_B for positive prices and quantities (i.e., for all P_B, Q_B > 0). Assume that the marginal cost of this firm is equal to its average total cost and is constant at $4 per unit produced.

Based on this information, your task is to use excel to set up diagrams that show the demand and the marginal revenue curves of this firm, as well as the quantities and prices it charges in each market, and also calculate the firm's total profit from selling in the two markets.