Multiple Choice Question Assume that Wally World uses a periodic weighted average inventory system. During the year, it had two sales. Calculate the weighted average cost per unit on hand as of June 30 when it figured its cost of goods sold for the month. Date Jan. 1 Activity Beginning Inventory 8 $12 Jun. 5 Purchase 12 $15 Jun. 28 Purchase 10 @ $18 Jun. 8 Sale 6 units Jun 30 Sale 8 units O $15.20/unit O $18/unit O $10/unit O $15/unit