Perpetual inventory using FIFO Beginning inventory, purchases, and sales for Item Zeta are as follows: Oct. 1 Tnventory 73 units $15 Oct. 7 Sale 57 units od 15 Pittas 72 units $18 Oct 24 Sale 23 units a ser un entom and using the first-in, first-out (FIFO) method, determine (a) the cost of goods sold on October and (b) the inventory on October 11. Cont of goods sold on October 24 b. Inventory on October 31