Trey Monson starts a merchandising business on December 1 and enters into the following three inventory purchases. Monson uses a perpetual inventory system. Also, on December 15, Monson sells 15 units for $32 each. Purchases on December 7 Purchases on December 14 Purchases on December 21 10 units @ $18.00 cost 20 units @ $24.00 cost 15 units @ $26.00 cost Required: Determine the costs assigned to the December 31 ending inventory based on the FIFO method. Perpetual FIFO: Goods Purchased Cost of Goods Sold Date Cost Per # of Units Unit Goods Purchased # of Units Sold Cost Per Cost of Goods Unit Sold # of Units Inventory Balance Cost Per Unit Inventory Balance December 7 December 14 Total December 14 December 15