FIFO and LIFO Costs Under Perpetual Inventory System The following units of an item were available for sale during the year: Beginning inventory 39 units at $49 Sale 36 units at $74 First purchase 20 units at $50 13 units at $74 Second purchase 30 units at $51 Sale 23 units at $76 The firm uses the perpetual inventory system, and there are 17 units of the ite a. What is the total cost of the ending inventory according to FIFO? Sale b. What is the total cost of the ending inventory according to LIFO