Month Total Maintenance Costs Total Machine Hours January February March April May June $2,640 3,000 3,600 4,500 3,200 4,620 3.500 4,000 6,000 7,900 5,000 8,000 Instructions (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 2.000-hour incroments and $1,000 cs