Perpetual Inventory Using FIFO Beginning inventory, purchases, and sales for Item Zeta are as follows Oct. Inventory 43 units $20 Sale 33 units 15 Purchase 35533 Sale Asuming a perpetual inventory system and using the first in, first-out.ro) 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 Inventory on October 31