Purchases on December 20 units $10.ee cost Purchases on December 36 units @ $15.00 cost 14 Purchases on December 30 units @ $18.00 cost QS 5-10 Perpetual: Assigning costs with FIFO LO P1 Required: Monson uses a perpetual inventory system. Determine the costs assigned to the December 31 ending inventory based method. Perpetual FIFO: Goods Purchased Inventory Balance # of Units Date Cost Per Unit Cost of Goods Sold # of Cost Per Cost of Goods Units Unit Sold Sold Goods Purchased #of Units Cost Per Unit Inventory Balance December 7 December December