Caloulator Beginning inventory, purchases, and sales for an inventory item are as follows: $16 31 units 18 units 32 units 32 units Sep. 1 Beginning Inventory 5 Sale 17 Purchase $17 Sale 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, October 31