REI sells snowboards. Assume the follaving information relates to REI's purchases of snowboards dunng septembec During the same month, $106$ snowboards were sold. REI uses a periodic inventory system.

$\backslash$table$[[$Date$,$Explanation,Units,Unit Cost,Total Cost$],[$Sept$.1,$Inventory,$15,$$$106,51\mathrm{.}590],[$Sept$.12,$Purchases,$46,109,5,014],[$Sept$.19,$Purchases,$54,110,5,940],[$Sept$.26,$Purchases,$21.,111,2,331],[,$Totals,$136,,$$$14\mathrm{.}875$