COSC Methods Aug. 7 The units of an item available for sale during the year were as follows: Jan. 1 Inventory 9 units at $3,200 $28,800 Purchase 15 units at $3,400 51,000 Dec. 11 Purchase 14 units at $3,500 49,000 38 units $128,800 There are 19 units of the item in the physical inventory at December 31. The periodic inventory system is used. Determine the inventory cost using first-in, first-out (FIFO) method; (b) the last-in, first-out (LIFO) method; and (c) the weighted average cost method (Round per unit cost to two decimal places and your final answer to the nearest whole dollar). 3. First-in, first-out (FIFO) b. Last-in, first-out (FO) Weighted average cost