Beginning inventory, purchases, and sales for an inventory item are as follows:

Sep. $1$ Beginning Inventory

$5$ Sale

$17$ Purchase

$30$ Sale

$24$ units @ $$15$

$17$ units

$10$ units @ $$20$

$8$ units

Assuming a perpetual inventory system and the first$-$in$,$ first$-$out method:

a$.$ Determine the cost of goods sold for the September $30$ sale.

$

$x$

b$.$ Determine the inventory on September $30.$

$ $,x$