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 7,000 coples and paid a total of $360 in March; in May, the firm paid $280 for 5,000 coples. The company uses the high-low method to analyze costs. Fulton's variable cost per copy is: Multiple Choice $0,040 $0.051 $0.053 $0.056