Question: Can this plugin do a single exception

We have products in variation, but the owner of the site wants, if you buy two items of #80 dollars (this will be the only case by the way). then instead of $160, it should add up to $140.

But all products are variations, but only the $80 dollars will apply this, if two $80 dollars are purchased, if 3 $80 it won’t apply.

Thank you,