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. Purchases on December ? Purchases on December 14 purchases on Decenter 21 20unitse$14.09cost36unitse$21.00cost30units&$25.00cost Determine the costs assigned to ending inventory when costs are assigned based on the LIFO method