Shamrock sells a snowboard, EZslide, that is popular with snowboard enthusiasts. Below is information relating to Shamrock's purchases of EZslide snowboards during September. During the same month, 105 EZslide snowboards were sold. Shamrock uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Sept. 1 Inventory 15 $112 $1,680 12 Purchase 45 114 5,130 19 Purchase 50 116 5,800 26 Purchase 20 117 2,340 Total 130 $14,950