I have the Ultimate Closer upgrade so when I sell things to a vendor it explains the base amount I will be getting as well as the bonus amount for the upgrade.
This works fine when I have multiple items to sell and the bonus amount ends in 5 or 0.
Unfortunately this doesn't work when the bonus amount ends in 6 or 8, etc.
If I want to get the full amount of bonus I must sell each item one at a time.
I figure this must be a bug because, as I said, it multiplies perfectly when it is a 5 or 0.