Co.s purchases and sales of a particular product during the year are shown below: Jan. 1 Beginning Inventory 1,500 units @ $ 10 Jan. 18 Purchase 1,250 units @ $ 12 Jan 20 Sold 1,500 units @ $ 20 Jan. 25 Purchase 1,750 units @ $ 14 Jan. 27 Sold 1,750 units@ $ 25 Jan. 29 Purchase 500 units @ $ 15 Assuming that company uses perpetual inventory system, determine the ending inventory as of Jan. 31 and make the journal entry for Jan. 20 transaction by using inventory subsidiary ledger for FIFO cost flow assumption.