Shamrock, Inc. uses a periodic inventory system. Its records show the following for the month of May, in which 74 units were sold. Date May 1 15 24 Explanation Inventory Purchase Purchase Total Units 33 27 40 100 Unit Cost $9 10 11 Total Cost $297 270 $1.007 (a) Your answer is correct. Calculate the weighted-average unit cost. (Round answer to 3 decimal places, eg. 5.125.) Weighted-average unit cost $ 10.07 eTextbook and Media Solution Attempts: 2 of 3 used Using multiple attempts has impacted your score. 10% score reduction after attempt 1 (b) Calculate the ending inventory at May 31 using the FIFO, LIFO and average-cost methods. (Round answers to O decimal places, eg. 125.) FIFO LIFO AVERAGE-COST The ending inventory at May 31 S S $