Check my Trey Monson starts a merchandising business on December 1 and enters into the following three inventory purchases. Also, on December 15, Monson sells 15 units for $20 each. Purchases on December 7 Purchases on December 14 Purchases on December 21 10 units @ $ 6.ee cost 20 units $12.00 cost 15 units $14.ee cost Required: Monson sells 15 units for $20 each on December 15. Monson uses a perpetual inventory system. Determine the costs assigned to ending inventory when costs are assigned based on the weighted average method. Cost of Goods Sold # of units Cost of sold unit Goods Sold Weighted Average - Perpetual: Goods purchased Date # of Cost per Inventory units unit Value December 7 December 14 Cost per Inventory Balance # of units Inventory unit Balance Cost per Average cost