WorldTip Pro is a handy tip calculator, providing an ability to simply slide your tip slider to the desired percentage, making it useful for just about any country. Adjust your split, if you have to divide your bill between others and hit "Calculate". Thats it. Simple.
Comes will full instructions.
The full version will even take a photo of your receipt for your records whilst within the app, supports sound effects and of course will save your favourite tip setting.