150 4. You are provided with the following information for Ister Ltd. for the month ended January 31, 2017. Ister uses a periodic method for inventory. Date Description Units Unit Cost / Selling Price October 3 Beginning inventory 48 October 6 Purchase 250 52 October 11 Sale 200 70 October 15 Purchase 150 54 October 22 Sale 150 80 October 27 Purchase 200 56 October 29 Sale 250 80 Calculate (a) ending inventory, (b) cost of goods sold under each of the following methods. a. FIFO. b. LIFO c. Weighted average cost