Beginning inventory, purchases, and sales for an inventory item are as follows: Sep. 1 Beginning Inventory 30 units $23 5 Sale 17 units 17 Purchase 31 units $24 30 Sale 33 units Assuming a perpetual inventory system and the first-in, first-out method, determine (a) the cost of the goods sold for the September 30 sale and (b) the inventory on September 30. a. Cost of goods sold b. Inventory, September 30