Lois Inc. uses a periodic inventory system. Its records show the following for the month of May, in which 78 units were sold.
Date Explanation Units Unit Cost
Total Cost
May 1 Inventory 30 $ 8 $ 240
May 15 Purchase 25 10 250
May 24 Purchase 40 11 440
Total 95 $ 930
Calculate the ending inventory at May 31 using the (a) FIFO, (b) average cost, and (c) LIFO methods