[The following information app 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 28 units for $10 each Purchases on December 7 Purchases on December 14 Purchases on December 21 18 units @ $4.00 cost 35 units @ $6.00 cost 28 units @ $7.00 cost Determine the costs assigned to ending inventory when costs are assigned based on the FIFO method. Periodic FIFO: Goods Available for Sale Cost of Goods Sold Cost of Goods #of Cost per Cost of # of units Available for units unit Sale unit Goods Sold Ending Inventory #of units Cost per Ending in ending unit Inventory Inventory Cost per sold $ Purchases December 7 December 14 December 21 Total 0.00 0.00