Unless you're Rain Man, chances are you can't calculate tons of complicated formulas in your head. At least, not if you want to come up with the right answer anyway. So what do you do when you're out having coffee with a client and he asks about the benefits of one investment over another? Sure, you could go all the way back to your office and hash out the details. Or you could just pull up one of these apps and order another round.
Looking for more cool apps? Check out the rest of this series:
$1.99, for Android devices