The controller of Oriole 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 $2,376 264 February 2,640 308 March 3,168 440 April 3,960 608 May 2,816 352 June 4,840 616 (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 $ LA