Ramirez Corp. uses the periodic inventory system. During its first year of operations, Ramirez made the following purchases $($listed in order of purchase$)$:

$40$ units at $$100$

$70$ units at $$80$

$170$ units at $$60$

Sales for the year totaled $270$ units, leaving $10$ units on hand at the end of the year.

Ending inventory using the average cost method $($rounded$)$ is:

$$650.$

$$1,000.$

$$707.$

$$600.$