Shamrock. Inc. uses periodic inventory system. Its records show the following for the month of May, in which 74 units were sold. Date Explanation Units Unit Cost Total Cost May 1 15 24 Inventory Purchase 30 25 26 $9 10 $270 250 Calculate the weighted-average unit cast. (Round answer to 3 decimal piaces, e.g. 5.125 Weighted-average unit casts Calculate the ending inventory at May 31 using the FIFO, LIFO and average-cost methods. (Round answers to 0 decimai places, e.g. 125.) FIFO LIFO AVERAGE-cOST The ending inventory at May 31 Click If you would llke to Show Work for this question: pen Show work