Trey Monson starts a merchandising business on December 1 and enters into the following three inventory purchases. Monson uses a periodic inventory system. Also, on December 15, Monson sells 28 units for $10 each Purchases on December 7 Purchases on December 14 Purchases on December 21 18 units @ $4.ee cost 35 units @ $6.00 cost 28 units @ $7.00 cost Determine the costs assigned to ending inventory when costs are assigned based on the weighted average method (Amounts to be deducted should be indicated with a minus sign. Round cost per units to 2 decimals.) Periodic Weighted Average Purchase - December 7 Purchase - December 14 Purchase - December 21 Available for Sale December Sales Total Inventory on hand Cost of Goods Sold of units Cost per Inventory of units Avg. Cost per Cost of unit Value sold unit Goods Sold 187 $ 4.00 5 72 35 6.00 210 28 7.00 196 B1 478 0 478 81 $ 0 $ 0