The controller of Sandhill Industries has collected the following monthly expense data for use in analyzing the cost behavior of maintenance costs. Total Machine Hours Month January February March April May June Total Maintenance Costs $2,640 2.940 3.540 4,440 3.140 5,440 350 400 550 640 550 750 (a 1) Determine the variable cost components using the high-low method. (Round answer to 2 decimal places eg. 2.25.) Variable cost per machine hour $