Teal Mountain sells a snowboard, EZslide, that is popular with snowboard enthusiasts. Below is information relating to Teal Mountain's purchases of EZslide snowboards during September. During the same month, $105$ EZslide snowboards were sold. Teal Mountain uses a periodic inventory system.

$\backslash$table$[[$Date$,$Explanation,Units,Unit Cost,Total Cost$],[$Sept$.1,$Inventory,$15,$$$120,$$$1,800$