The controller of Ivanhoe Industries has collected the following monthly expense data for use in analyzing the cost behaviour of maintenance costs: Total Maintenance Costs Month Total Machine Hours January $ 2,750 2,950 February 3,050 4,250 March 3.950 6.300 April 4.540 8.200 May 3.560 5.450 June 5.882 8.350 -71 (a 1) Determine the variable-cost component using the high-low method. (Round answer to 2 decimal places eg. 12.25.) Variable cost $ per machine hour