The following table gives the total cost and total revenue schedule for a monopolist.

Quantity	Total Cost (in dollars) ($)	Total Revenue (in dollars) ($)
0	144	0
1	160	90
2	170	160
3	194	210
4	222	240
5	260	250
6	315	240
7	375	210

A. Calculate the marginal revenue and marginal cost.

b. Determine the profit-maximizing price and quantity, and calculate the resulting profit.

c .Sketch the demand curve, the marginal revenue curve, and the marginal cost curve, and show how to derive the profit-maximizing quantity graphically.