Aimed at combining powerful and easy to use financial calculators for iPhone users on the go. The third release of iCalc provides you with a simple and effective iPhone Tip Calculator. Great for when you are dividing the guest check and you want to know how much tip to leave. You can also divide the total by the number of people in your party. Try with TestiPhone
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It is a good calculator
Here is one that does everything you need, and it’s based on a Star Rating System that derives the appropriate tip percentage and is fully configurable to your preference.
The app name is “Rate My Tip”.