Use the inventory information for the month of September in the attachment to answer the question below. Assuming that a perpetual inventory system is used, what is ending inventory on a FIFO basis? (Round the answer to the nearest dollar.) Sept. 1 Beginning inventory 5 Purchase 14 Sale 21 Purchase 30 Sale 10 units @ $120 60 units @ $112 40 units @ $140 30 units @ $116 28 units @ $140