E5.6 SurfsUp Ltd sells a snowboard, Xpert, that is popular with snowboard enthusiasts. Below is information relating to SurfsUp's purchases of Xpert snowboards during May. During the same month, 124 Xpert snowboards were sold. SurfsUp uses a periodic inventory system Explanation Inventorv Purchases Purchases Purchases Totals Units 26 28 Unit cost $ 97 102 104 105 Date Total cost May 1 12 19 26 $ 2522 4590 2912 4 200 $14 224 40 Required (a) Calculate the ending inventory at 31 May using the FIFO and LIFO methods. Prove the amount allocated to cost of sales under each method (b) For both FIFO and LIFO, calculate the sum of ending inventory and cost of sales. What do you notice about the answers you found for each method