iTip
$0.99 from palaware 
iTip is the perfect tipping calculator for your iPhone or iPod touch. With just a few taps you can easily determine the tip to leave your server. Easily round your tips up or down to the nearest dollar. iTip will even split your bill making it very simple to figure out what each person in your party owes. iTip allows you to calculate tips based on a percentage or the quality of service and will even allow for the exclusion of tax. iTip will provide you with the perfect tip every time.
Features
• Allows for any Tip percentage
• Allows for the exclusion of Tax from the tip
• Allows tip to be calculated based on 2x tax
• Large Numeric keypad
• Split the Bill between any number of party members
• Easy one tap rounding up or down
• Only required input is the bill amount
