Addi$$n$,$ Inc. uses a perpetual inventory system. Information about one inventory item for the month of September follows.

Sep. $1$ Inventory

$4$ Sold

$10$ Purchased

$17$ Sold

$30$ Purchased

$20$ units at $$20$

$10$ units

$30$ units at $$25$

$20$ units

$10$ units at $$30$

If Addison uses LIFO, the September $30$ inventory balance is

a$.$ $$650$

b$.$ $$700$

c$.$ $$800$

d$.$ $$75$