View Policies Show Attempt History Current Attempt in Progress Carla Vista Co. uses a periodic inventory system. Its records show the following for the month of May, in which 70 units were sold. Your answer is incorrect. Calculate the weighted-average unit cost. (Round answer to 3 decimal places, es 5.125.) Calculate the ending inventory at May 31 using the FIFO, LIFO and average-cost methods. (Round answers to 0 decimal places, es. 125.)