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Trey Monson starts a merchandising business on December 1 and enters into three inventory purchases: Required: Monson sells 28 units for $10 each on December 15. Assume the periodic inventory system is used. Determine the costs assigned t 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.)