Perpetual inventory using FIFO Beginning inventory, purchases, and sales for Item Zeta9 are as follows: Oct. 1 Inventory 200 units at $40 Oct. 7 Sale 180 units Oct. 15 Purchase 180 units at $45 150 units Oct. 24 Sale Assuming a perpetual inventory system and using the first-in, first-out (FIFO) method, determine (a) the cost of goods sold on October 24 and (b) the inventory on October 31. a. Cost of goods sold on October 24 b. Inventory on October 31