The following lots of a particular commodity were available for sale during the year:

Beginning inventory

First purchase

Second purchase

Third purchase

$10$ units at $$30$

$25$ units at $$32$

$30$ units at $$34$

$10$ units at $$35$

The firm uses the periodic system and there are $20$ units of the commodity on hand at the end of the year. What is the amount of inventory at the end of the year according to the last$-$in$,$ first$-$out method?

$$655$

$$620$

$$690$

$$659$