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The controller of Crane Industries has collected the following monthly expense data for use in analyzing the cost behavior of maintenance costs. Month Total Maintenance Costs Total Machine Hours January $2,880 330 February 3,180 380 March 3,780 530 April 4,680 660 May 3,380 530 June 5,520 730 (a1) Determine the variable cost components using the high-low method. (Round answer to 2 decimal places e.g. 2.25.) Variable cost per machine hour $enter the variable cost per machine hour in dollars rounded to 2 decimal places