D. (Chapter 13, 3-5, 2). a. Sometimes, our discussion of marginal cost and marginal revenue unintentionally hides the real issue: the entrepreneur's quest to maximize total profits. Here is information on a firm: Demand: P = 50 Q. Fixed cost = 100, marginal cost = 10. Using this information, calculate total profit for each of the values in the following table, and then plot total profit in the figure below. Clearly label the amount of maximum profit and the optimum quantity that produces this level of profit. Quantity Total Revenue Total Cost Total Profit 18 19 20 21 22 23 Prot