Big party? Lots of credit cards from lots of people? Why bother with a calculator and all that division. Just use the Check Please application. Not only does it easily calculate the tip, it makes splitting the bill a snap. Just enter the check total, the amount your party wants to tip and the number of peopled in your party. Viola! It calculates how much to put on each card.
Update: Now defaults to the number lock when entering amounts
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Updated: February 9, 2010
License: Closed Source