3. On June 1, 2020, Company AAA has 10 units of inventory with a unit cost of $5. The company purchased additional 10 units @ $5.5,15 units @$4, and 20 units @ $6 on June 5, June 15, and June 28, respectively. The company sold 15 units each on the following dates: June 6 , June 18 , and June 29. What is the cost of ending inventory using the LIFO cost flow in a perpetual inventory system? $50 $51.25 $55 $60