REI sells snowboards. Assume the following information relates to REI's purchases of snowboards during September. During the same month, $103$ snowboards were sold.

$\backslash$table$[[$Date$,$Explanation,Units,Unit Cost,Total Cost$],[$Sept$.1,$Inventor

y$,14,$$$110,$$$1,540$

Calculate the weighted$-$average unit cost. $($Round answers to $3$ decimal places, e$.$g$.5\mathrm{.}125.)$

September $1$$

September $5$ $

September $12$$

September $16$$

September $19$ $

September $26$$

September $29$$