Assume that individuals are homogeneous and that each has a demand curve for online game service: P=35-0.5Q where P is the price per hour and Q is hours per month. Assume the firm has a total cost TC = 10Q + Q2. The profit maximising two-part tariff results in the firm setting a per unit price equal to $_____and fixed fee $ from each consumer: 10; 400. O 10; 589: O 30; 25. O 35; 589. 30; 90