Trumpeting Trumpets has the following inventory data: July 1 5 14 21 30 Beginning inventory Purchases Sale Purchases Sale 50 units at $120 300 units at $112 200 units 150 units at $115 140 units Assuming that a periodic inventory system is used, what is the cost of goods sold using the average cost assumption? $18,192 $38,658 $38,480 $18,370