I spend 99 cents on this app just as I was heading out to negotiate a used car purchase with my wife. When the dealer came back with his counter offer, I immediately whipped out my iPhone and ran the numbers through the calculator and managed to work more than $100 per month off of my payments over a 6 year loan!!
For 99 cents, I saved 6 Grand -- and my wife was SO impressed.
If you are financing anything, bring this app with you.
JVCJVC about Loan Calculator Pro, v3.1