Costs assigned to Dec 31 ending inventory based on LIFO?

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 $24 each. Parchasesonbecenber7Purchasesonbeceeber14PurchasesonDecenber2110units$10,00cost20units$16.00cost15unitse$18.00cost Determine the costs assigned to ending inventory when costs are assigned based on the LIFO method