E5-3 The controller of Furgee Industries has collected the following monthly expense data for use in analyzing the cost behavior of maintenance costs. Instructions Total Total Month Maintenance Costs Machine Hours January $2,500 300 February 3,000 350 March 3,600 500 April 4,500 690 May 3,200 400 June 4,900 700 (a) Determine the fixed- and variable-cost components using the high-low method. (b) Prepare a graph showing the behavior of maintenance costs, and identify the fixed- and variable-cost elements. Use 100-hour increments and $1,000 cost increments.