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Perpetual Inventory Using FIFO Beginning inventory, purchases, and sales for Item Zeta9 are as follows: Oct. 1 Inventory 35 units @ $21 23 units 34 units @ $24 16 units 7 Sale 15 Purchase 24 Sale 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