The units of an item available for sale during the year were as follows: Jan. 1 Inventory 15 units at $3,500 $52,500 Aug. 7 Purchase 18 units at $3,600 64,800 Dec. 11 Purchase 14 units at $3,700 51,800 47 units $169,100 There are 16 units of the item in the physical inventory at December 31. The periodic inventory system is used. Determine the inventory cost using (a) the 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). a. First-in, first-out (FIFO) $ b. Last-in, first-out (LIFO) C. Weighted average cost $ $