Headlands Industries uses a periodic inventory system. Its records show the following for the month of May, in which 77 units were sold. Date Explanation Units Unit Cost Total Cost y 1 $340 $10 Inventory 34 286 Purchase 15 26 11 480 24 Purchase 40 12 $1,106 Total 100 Calculate the weighted-average unit cost. (Round answer to 3 decimal places, e.g. 5.125.) $ Weighted-average unit cost eTextbook and Media Calculate the ending inventory at May 31 using the FIFO, LIFO and average-cost methods. (Round answers to 0 decimal places, e.g. 125.) LIFO FIFO AVERAGE-COST $ $ The ending inventory at May 31 $