The controller of Crane Industries has collected the following monthly expense data for use in analyzing the cost behavior of maintenance costs. Total Maintenance Costs Total Machine Hours Month January $3,102 4,110 February 3,525 4,700 March 4,230 7,050 April 5,125 9,282 May 3.760 5,875 June 5.226 9,420 (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 $