Sheridan Company accumulates the following data concerning a mixed cost, using miles as the activity level. Miles Driven Total Cost Miles Driven Total Cost January 7,995 $14,200 March 8,510 $14,810 February 7,510 13,510 April 8,195 14,495 (a1) Compute the unit variable costs using the high-low method for this mixed cost. (Round answer to 2 decimal places, e.g. 2.25.) Variable cost per mile