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 15 units for $37 each. Purchases on Decenber 7 Purchases on December 14 Purchases on December 21 10units$23.e0cost20units$29.00cost15units$31.00cost Determine the costs assigned to ending inventory when costs are assigned based on the LIFO method