Ivanhoe Center began operations on July $1.$ It uses a perpetual inventory system. During July, the company had the following

purchases and sales.

$($a$1)$

Calculate weighted$-$average unit cost. $($Round answers to $3$ decimal places, e$.$g$.15\mathrm{.}251.)$

July $1$$

July $6$$

July $11$$

July $14$$

July $21$$

July $27$$