The graph shows the demand curve faced by a pure monopolist. a. Move the interactive point to identify where marginal revenue (MR) is equal to marginal cost (MC) for this monopolist, use the shape to identify the firm's profits, and then answer the question and complete the sentence. 100 MR MC Marginal Cost Profits: Average Total Cost 888 Price (5) 8888 50 40 30 60 20 10 Marginal Revenue Demand 0 0 10 20 30 40 50 Quantity 60 70 80 90 100