Suppose the demand functions facing the wireless telephone monopolist in Worked-Out Problem 18.4 are instead QdL = 40 - 100P for each low-demand consumer and QdH = 120 - 100P for each high-demand consumer, where P is the per-minute price in dollars. The marginal cost is $0.10 per minute. Suppose the monopolist offers only a single two-part tariff. What will be the monopolist's profit from each type of consumer if it charges a per-minute price of $0.10 and a fixed fee that causes both types of consumers to make a purchase? What if it charges a per-minute price of $0.20? If there are 100 high-demand consumers, how many low-demand consumers can there be for the monopolist to find the $0.20 per-minute price more profitable?