Great app

I love this app but I would like to know if it would be possible to add away to do a tip out on it? Just an idea and question, However I think this app is simply amazing. I was wondering if there would be away to automatically add or multiply the taxes in different places you go to plus tip. I mean it when I say this is really good.

Keep up the great work

Doublehelix70 about Llumino, v1.1.4