The controller of Carla Vista Industries has collected the following monthly expense data for use in analyzing the cost behavior of maintenance costs. Total Machine Hours 288 Month January February March April May June Total Maintenance Costs $2,592 2.880 3,456 4,320 3,072 5,280 336 480 664 384 672 (a 1) Determine the variable cost components using the high-low method. (Round answer to 2 decimal places es. 2.25) $ Variable cost per machine hour