Swanson and Associates presently leases a copy machine under an agreement that calls for a fixed fee each month and a charge for each copy made. Swanson made 7,000 copies and paid a total of $360 in March; in May, the firm paid $280 for 5,000 copies. The company uses the high-low method to analyze costs.

How much would Swanson's pay if it made 5,500 copies?

a. $382.50

b. $322

c. $300.

d. $292.50

An amount other than those given above?