Purchases on December 20 units $10.0e cost 7 Purchases on December 36 units $15.00 cost 14 Purchases on December 30 units @ $18.00 cost 21 QS 5-13 Perpetual: Inventory costing with specific identification LO P1 Required: Monson sells 30 units for $25 each on December 15. Of the units sold, 16 are from the December 7 purchase and 14 are from the December 14 purchase. Monson uses a perpetual inventory system. Determine the costs assigned to the December 31 ending inventory when costs are assigned based on specific identification. Specific Identification-Perpetual: Goods purchased Cost of Goods Sold Inventory Balance # of Cost per Cost of Goods unit Cost per unit Inventory Cost per unit # of # of units Date units sold Balance Sold units December 7 December 14 December 15 IDecember 21 18.00