Riverbed Corp uses a periodic inventory system. Its records show the following for the month of May, in which 75 units were sold. Date Units Unit Cost Total Cost Explanation Inventory May 1 28 $8 $ 224 15 Purchase 23 11 253 24 Purchase 36 13 468 Total 87 $945 Calculate the ending inventory at May 31 using the FIFO, LIFO and average-cost methods. (Round average unit cost to 2 decimal places, es 2.51 and final answers to decimal places, s. 125) FIFO LIFO AVERAGE-COST Ending Inventory at May 31 $