Current Attempt in Progress Sandhill Company accumulates the following data concerning a mixed cost, using units produced as the activity level. Units Produced Total Cost March 12,000 $21,600 April 10.800 19.920 May 12,600 22,264 June 10,440 19,348 July 11,400 20,480 (a 1) Your answer is incorrect. Compute the variable cost per unit using the high-low method. (Round answer to 2 decimal places, e.g. 2.25.) Variable cost per unit $