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 15,000 copies and paid a total of $360 in March; in May, the firm paid $310 for 10,000 copies. The company uses the high-low method to analyze costs.

Swanson's monthly fixed fee is (Round your intermediate calculations to 3 decimal places final answer to nearest dollar amount):