OBJ.4 PE 7-5B 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 Aug. 13 Nov. 30 Available for sale Inventory Purchase Purchase 30 units at $460 330 units at $437 50 units at $456 410 units $ 13,800 144,210 22,800 $180,810 There are 73 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