Everybody who borrows from libraries has had experience with paying fines. I've seen many complain if the fine is even 10 cents more than they figured. Here's a concept: Tell them to keep the change.
It's not that big a deal. Pay in dollars, and say keep the change. As a donation. Or pay with a 5 or a 10. Yes, our tax money goes to our libraries. But it's not enough. Donations are always welcome, even if they're small. And, remember, if 50 people a day give an average of 50 cents a day, that comes to $25/day, or $150 a week ($175 if the library is open on Sunday). That's not an inconsiderable amount of money.
So, once again, next time when you pay a fine, don't haggle over dimes. Say, "Keep the change."