You are provided with the following information for Koetteritz Inc. for the month ended June 30, 2020. Koetteritz uses the periodic method for inventory. Date Description Quantity Unit Cost or Selling Price June 1 Beginning inventory 40 $40 June 4 Purchase 135 43 June 10 Sale 110 70 June 11 Sale return 15 70 June 18 Purchase 55 46 June 18 Purchase return 10 46 June 25 Sale 65 76 June 28 Purchase 35 50 Calculate cost per unit. (Round answer to 2 decimal places, e.g. 5.25.)