Exercise 6-5 Pearl Industries uses a periodic inventory system. Its records show the following for the month of May, in which 76 units were sold Date Explanation May 1 Inventory 15 Units Unit Cost Total Cost 27 $243 270 374 $887 $9 27 10 Purchase Purchase Total Calculate the ending inventory at May 31 using the FIFO, LIFO and average-cost methods. (Round answers to O decimal places, e.g. 125.) FIFO LIFO AVERAGE-COST The ending inventory at May 31 s