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 $$55$

$25$ units at $$65$

$30$ units at $$68$

$15$ units at $$70$

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 the inventory at the end of the year according to the lower of cost or market, using the first$-$in$,$ first$-$out method, if the current replacement cost is $$68$ a unit?

$$1,200$

$$1,100$

$$1,360$

$$1,390$