The controller of Ivanhoe 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 $2,322 258 February 2,580 301 March 3,096 430 April 3,870 594 May 2,752 344 June 4,730 602 (a1) Determine the variable cost components using the high-low method. (Round answer to 2 decimal places eg, 2.25.) Variable cost per machine hour $