Shamrock, Inc. uses a periodic inventory system. Its records show the following for the month of May, in which 74 units were sold. ate Explanation Units Unit Cost Total Cost ay 1 Inventory Purchase Purchase 1 25 36 $9 10 11 $270 250 396 Total $916 Calculate the weighted average unit cost. (Round answer to 3 decimal places, e.g. 5.125.) hted-average unit cost $ Calculate the ending inventory at May 31 using the FIFO, LIFO and average-cost methods. (Round answers to 0 decimal places, e.g. 125.) FIFC The ending inventory at May 31 $