REI sells snowboards. Assume the following information relates to REl's purchases of snowboards during September. During the same month, $110$ snowboards were sold. REI uses a periodic inventory system.

$\backslash$table$[[$Date$,$Explanation,Units,Unit Cost,Total Cost,$],[$Sept$.1,$Inventory,$11,$$$110,$$$1,210,],[$Sept$.12,$Purchases,$53,113,5,989,],[$Sept$.19,$Purchases,$55,114,6,270,],[$Sept$.26,$Purchases,$25,115,2,875,],[$Totals$,144,,$$$16,344,$t$]]$