The controller of Cullumber 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 $3,192 4,230 February 3,627 4,836 March 4,352 7,254 April 5,210 9,551 May 3,869 6,045 June 5,368 9,670 (a1) Your answer is incorrect. 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 +A $ 1500