Required information Trey Monson starts a merchandising business on December 1 and enters into the following three inventory purchases. Also, on December 15, Monson sells 28 units for $50 each Purchases on December 7 Purchases on December 14 Purchases on December 21 18 units @ $20.ee cost 32 units @ $30.ee cost 28 units @ $36.00 cost Required: Monson sells 28 units for $50 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. (Round your per unit costs to 2 decimal places.) Weighted Average - Perpetual: Goods purchased #of Cost per Inventory Date units unit Value Inventory Balance Cost of Goods Sold # of Cost per units Cost of sold unit Goods Sold # of units Cost per unit Inventory Balance December 7 $ 0.00 December 14 $ 0.00 Average cost $ 0.00 December 15 $ 0.00 December 21 $ 0.00 Average cost Totals $ 0.00