Fulton and Sons, Inc. presently leases a copy machine under an agreement that calls for a fixed fee each month and a charge for each copy made. Fulton made 12,000 copies and paid a total of $660 in March; in May, the firm paid $580 for 10,000 copies. The company uses the high-low method to analyze costs. Fultons monthly fixed fee is: (Do not round your intermediate calculations and round your final answer to nearest dollar amount.)