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 15 units for $20 each. Purchases on December 7 Purchases on December 14 Purchases on December 21 10 units $6 cost 20 units $12 cost 15 units $14 cost Determine the costs assigned to ending inventory when costs are assigned based on the weighted average method. (Round your per unit costs to 2 decimal places.) Weighted Average - Perpetual: Goods purchased Cost of Goods Sold Inventory Balance of Date #of units Cost per unit Inventory Value units sold Cost per Cost of Goods unit of units Sold Cost per unit Inventory Balance $ 0.00 $ 0.00 December 7 December 14 Average cost December 14 December 15 December 21 Average cost December 21 Totals $ 0.00 $ 0.00 0.00