During July, the following purchases and sales were made by Martine Company. There was no beginning inventory. Martine Company uses a perpetual inventory system. Accounting Transactions Date Purchases Date Sales July 3 50 units @ $10 July 13 78 units 11 50 units @ $11 22 21 units 20 21 units @ $13 Under the LIFO method, the ending inventory is: I need help with this Q, please. Thank you