Erie Hardware, Inc. operates a chain of four retail stores. Data on the company’s maintenance costs for its store buildings and furnishings are as follows:

Using the high-low method, estimate and graph the cost behavior for the firm’s maintenance costs.

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Month January Maintenance Cost $53,000........ Sales $600,000 February March 55,000 700,000 47,000 550,000 April 51,000 650,000 May 45,000 500,000 June 49,000 610,000