- A monopolist has the demand and marginal cost as shown in the table below. There is a fixed cost of $80 in the production. 1 100 100 2 180 3 240 60 4O 4 280 40 50 5 300 20 60 - (a) If the monopolist practices single pricing, determine the price, quantity, and profit of the monopolist. - (b) If the monopolist practices perfect price discrimination, determine the price, quantity and profit in the market