FIFO and LIFO Costs Under Perpetual Inventory System The following units of an item were available for sale during the year: Beginning inventory 21 units at $50 Sale 13 units at $75 First purchase 19 units at $52 Sale 18 units at $76 Second purchase 14 units at $55 Sale 11 units at $77 The firm uses the perpetual inventory system, and there are 12 units of the item on hand at the end of the year. a. What is the total cost of the ending inventory according to FIFO? $ b. What is the total cost of the ending inventory according to LIFO? $