E7-3 Inventory by three methods The units of an item available for sale during the year were as follows: Jan. 1 Aug. 13 Nov. 30 Inventory Purchase Purchase Available for sale 40 units at $165 300 units $ 6,600 200 units at $180 36,000 60 units at $200 12,000 $54,600 There are 75 units of the item in the physical inventory at December 31. The periodic inven-tory 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