The controller of Sand hill Industries has collected the following monthly expense data for use in analyzing the cost behavior maintenance costs. Total Total Month Maintenance Costs Machine Hours January $2,380 350 February 3,180 400 March 3380 550 April 4,680 640 May 3,380 550 June 5,080 7'50 (3 11 Determine the variable cost components using the highlow method. [Round answer to 2decirml' places 2.3. 2.25.] Variable cost per machine hour $