Important Note! Before you start working on this problem, wotch the Hint video. This video shows you exoctly how to work this problem. [The following information applies to the questions displayed below] Trey Monson starts a merchandising business on December 1 and enters into the following three inventory purchases. Monson uses a perpetual inventory system. Also, on December 15, Monson sells 30 units for $35 each mportont Note! Before you stort working on this problem, watch the Hint video. This video shows you exactly how to work this problem. Determine the costs assigned to ending inventory when costs are assigned based on the LIFO method