genow.com/ilm/takeAssignment/takeAssignmentMain.do?invoker=&takeAssignmentSessionLocator=&in. A Periodic Inventory Using FIFO, LIFO, and Weighted Average Cost Methods The units of an item available for sale during the year were as follows: Jan. 1 Inventory 15 units at $35 $525 Aug. 13 Purchase 5 units at $37 185 Nov. 30 Purchase 16 units at $39 624 Available for sale 36 units $1,334 There are 22 units of the item in the physical inventory at December 31. The periodic inventory system is used. Determine the inventory cost using the (a) first-in, first-out (FIFO) method; (b) last-in, first-out (LIFO) method; and (c) 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 815