Perpetual Inventory Using FIFO Beginning inventory purchases, and sales for Item Zeta9 are as follows: Oct. 1 68 units $21 Inventory Sale 7 48 units 15 Purchase 52 units $24 24 Sale 24 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. 612 X a. Cost of goods sold on October 24 1,056 X b. Inventory on October 31