Beginning inventory, purchases, and sales for an inventory item are as follows: Sep. 1 Beginning Inventory 24 units @ $15 5 Sale 11 units 17 Purchase 23 units @ $16 30 Sale 14 units Assuming a perpetual inventory system and the last-in, first-out method: a. Determine the cost of the goods sold for the September 30 sale. b. Determine the inventory on September 30