The table below shows the marginal revenue and costs for a monopolist. Demand, Costs, and Revenues Price Quantity Marginal Revenue (dollars) Demanded (dollars) $85 50 $85 79 150 76 73 250 64 67 350 52 61 450 40 55 550 28 Harginal Cost Average Total Cost (dollars) (dollars) $25 $139.00 85 103.30 64 87.50 61 80.00 67 77.00 77.00 דל Instructions Enter your answer as a whole number. If you are entering a negative number include a minus sign a. What is the monopolist's profit-maximizing level of output? units b. What is the monopolist's profit at the profit-maximizing level of output?