You have the following information for Waterway Inc. for the month ended June 30, 2022. Waterway uses a periodic inventory system. Unit Cost or Selling Price Date Description Quantity June 1 Beginning inventory 40 $51 June 4 Purchase 135 54 June 10 Sal 81 June 11 Sale return 15 81 June 18 Purchase 55 57 June 18 Purchase return 10 57 June 25 Sale 65 87 June 28 Purchase 35 61 Calculate cost per unit. (Round answer to 2 decimal places, e.g. 5.25.) Weighted-average cost per unit $