Determine ending inventory cost by (a) FIFO method, (b) LIFO method, and (c) average cost method. ) September 5 Compra (Purchase) 65 unidades a $6 cada una (65 units at $6 each) September 13 Compra (Purchase) 55 unidades a $8 cada una (55 units at $8 each) September 29 Compra (Purchase) 44 unidades a $10 cada una (44 units at $10 each) September 30 Inventario Final Ending Inventory 70 unidades (70 units)