Perpetual Inventory Using FIFO Beginning inventory, purchases, and sales for Item Zeta9 are as follows: Oct. 1 Inventory 40 units $19 2 Sale 31 units 15 Purchase 24 units $21 24 Sale 13 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 X b. Inventory on October 31