Grouper Corp. uses a periodic inventory system. Its records show the following for the month of May, in which 68 units were sold Date Explanation Units Unit Cost Total Cost $324 May 1 Inventory $9 15 Purchase 2210220 Purchase 42 11 462 Total $1,006 Calculate the weighted average unit cost. (Round answer to 3 decimal places, e.g. 5.125.) Weighted average unit cost $ Calculate the ending inventory at May 31 using the FIFO, LIFO and average-cost methods. (Round answers to decimal places. 125 FIFO LIFO AVERAGE-COST The ending inventory at May 31 $ e Textbook and Media