Piper Pipes has the following inventory data: July 1 Beginning inventory 20 units at $120 5 Purchases 120 units at $112 14 Sale 80 units 21 Purchases 60 units at $115 30 Sale 56 units Assuming that a periodic inventory system is used, what is the cost of goods sold on a LIFO basis? Group of answer choices $15,412. $7,348 $15,392. $7,328