Perpetual Inventory Using FIFO Beginning inventory, purchases, and sales for Item Zeta 9 are as follows: 24 Oct. 1 Inventory 67 units @ $17 7 Sale 54 units 15 Purchase 61 units @ $19 Sale 22 units 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