Beginning inventory, purchases, and sales for an inventory item are as follows: Sep. 1 Beginning Inventory 5 Sale 17 Purchase 30 Sale 33 units @ $13 19 units 35 units @ $15 36 units Assuming a perpetual inventory system and the first-in, first-out method: a. Determine the cost of goods sold for the September 30 sale. b. Determine the inventory on September 30.