Required information Trey Monson starts a merchandising business on December 1 and enters into three inventory purchases: Required: Monson sells 30 units for $25 each on December 15 . Assume the periodic inventory syljem is used. Determine the costs assigned to ending inventory when costs are assigned based on the LIFO method. Required information Trey Monson starts a merchandising business on December 1 and enters into three inventory purchases: Required: Monson sells 30 units for $25 each on December 15. Assume the periodic inventory system is used. 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.)