Hi, I need help with the following question.

Question 1: Why does a monopoly face downward sloping demand curve? When the monopoly increases output, the total revenue will not rise at a constant rate. Explain why. Question 2: A monopolist will always produce a quantity at which demand curve is elastic. Explain why. Question 3: Assume that we have only one firm producing tennis balls. See the diagram below showing the market for tennis balls and find the: the quantity of output maximizing the profit . the price monopolist is charging, value of the average revenue at the profit maximising level of production, value of the marginal cost at the profit maximising level of production, value of marginal revenue at the profit maximising level of production , value of the average total cost . What is the value of total revenue, total cost and total profit at the profit maximizing quantity? What would be the efficient level of output and price if the market was perfectly competitive? Price($) MC ATC 18 15 11 9 MR D 0 20 40 Quantity