Their job is to give you back change from what you paid. Yeah, simple math would’ve told them it’s $15 and everything evens out. But their job is not to play your silly little games just so you don’t have a few coins in your pocket.

Bc most of these machines tell you the exact change back. They get paid to do what the machine tells them, they don’t get paid to think. Thinking is above their pay grade. They don’t get paid enough to think. What’s simple for you isn’t simple for someone else. The moment you ask an employee to go further, you’re asking for too much. Even if it’s just an inch