Mather sells a snowboard, EZslide, that is popular with snowboard enthusiasts. The following is information relating to Mather's beginning inventory and purchases of EZslide snowboards during September. During the same month, 102 EZslide snowboards were sold. Mather uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Sept. 1 Inventory 12 $100 $ 1,200 Sept. 12 Purchases 45 103 4,635 Sept. 19 Purchases 50 104 5,200 Sept. 26 Purchases 20 105 2,100 Totals 127 $13,135