Perpetual Inventory Using FIFO Beginning inventory, purchases, and sales for Item Zeta 9 are as follows: Oct. 1 Inventory 57 units @ $19 7 Sale 43 units 15 Purchase 65 units @ $22 24 Sale 18 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