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

Date Line Item Description Units and Cost

Sep. $1$ Inventory $20$ units at $$20$

$4$ Sold $10$ units

$10$ Purchased $30$ units at $$25$

$17$ Sold $20$ units

$30$ Purchased $10$ units at $$30$

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

a$.$ $$650$

b$.$ $$700$

c$.$ $$800$

d$.$ $$750$