Clearvoice, a wireless telephone monopolist  has 100 consumers, each of whom has a monthly demand curve for wireless minutes of

Q=300-100P

where P is the per-minute price in dollars. The marginal cost of providing wireless service is $0.30 per minute.

a. Suppose the wireless telephone monopolist charges $0.30 per minute. How large a fixed fee can it charge and still persuade consumers to buy?

b. What is its profit from each consumer?

c. What is its total profit?

d. What would be its total profit with a per-minute charge of $0.40?

e. What would be its total profit with a per-minute charge of $0.50?

f. What would be its total profit with a per-minute charge of $0.60?