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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 @ $20.00 cost 32 units @ $30.00 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 Date Inventory units unit Cost of Goods Sold # of Cost per units Cost of unit sold Goods Sold Inventory Balance Cost per Inventory # of units unit Balance Value December 7 December 14 Average cost December 15 December 21 Average cost Totals