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Amanda Company accumulates the following data concerning a mixed cost, using units produced as the activity level. Units Produced Total Cost March 10,400 $18,200 April 9,240 17,150 May 10,900 18,670 June 8,800 15,541 July 9,600 17,800 (a1) Calculate the variable cost per unit using the highlow method. (Round variable cost per unit to 2 decimal places 6.3. 12.25.) Variable cost per unit $