Required information [The following information applies to the questions displayed below.] Trey Monson starts a merchandising business on December 1 and enters into the following three inventory purchases. Monson uses a periodic inventory system. Also, on December 15, Monson sells 15 units for $20 each. Purchases on December 7 Purchases on December 14 Purchases on December 21 10 units @ $ 6 cost 20 units @ $12 cost 15 units @ $14 cost Determine the costs assigned to ending inventory when costs are assigned based on the LIFO method. Answer is complete but not entirely correct. Periodic LIFO: Cost of Goods Available for Sale Cost of Goods Sold Inventory Balance # of units Cost per unit Cost of Goods # of units Available sold Cost per unit Cost of Goods Sold for Sale # of units in ending inventory Cost per unit Ending Inventory Purchases: December 7 10 $6.00 S 60 10 $6.00 $ 60 0 $6.00 S 0 December 14 20 12.00 240 512.00 $ 60 1512.00 180 December 15 14.00 21 210 014.00 15 14.00 $ 210 Total 45 $ 510 15 S 120 30 $ 390