Part 1 : Uniform pricing

If the fixed cost is 150,000 per month, marginal cost is 50.00, price is 50.00, Qd is 14,455 what is the formula to calculate the profits and what is the profits?

Part 2: 3rd degree price discrimination

if the fixed cost is 150,000 and marginal cost 50.00, the price of low income section town is 50.00, the Qd is 2744, the price of the high income section town is 50.00, and Qd is 11,711 what are the profits? what is the formula to calculate profits?

Part 3: Two-part Tariff

If the fixed cost is 12,000, marginal cost per visit is 15.00, price per office visit 15.00, number of office visits is 1269 number of people is 180 (note: some of the office visits will be by the same person and the number of people counts each person making an office visit once regardless of the number of the office visits) what is the formula to calculate profits and what is the profit for this problem?