Perpetual Inventory Using FIFO Beginning inventory, purchases, and sales for Item Zeta 9 are as follows: 67 units @ $25 Oct. 1 7 Inventory Sale 51 units 15 Purchase 69 units @ $26 24 Sale 21 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 9 b. Inventory on October 31 69