O 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 perpetual inventory system, Also, on December 15, Monson sells 23 units for $30 each Purchases on December 7 Purchases on December 14 Purchases on December 21 13 units $12.00 cost 30 units $18.00 cost 23 units # $22.00 cost Required: Determine the costs assigned to the December 31 ending inventory based on the FIFO method. Date Goods Purchased # of Units Cost Per Goods Unit Purchased Perpetual FIFO: Cost of Goods Sold #of Units Cost Per Cost of Goods Sold Unit Sold Inventory Balance Cost Per Inventory # of Units Unit Balance December December 14 Total December 14 December 15 Total December 15 December 21 Totais