I'm trying to find out what price of car I can afford but all the payment calculators ask what interest rate. How would I know this? I have good credit and think I need a 72 mo loan. Anyone know the usual rate?

Does anyone know of a multiple interest rate credit card calculator? I have one credit card, with two interest rates. One rate is for balance transfers the other is for actual purchases (yes I'm working on getting that changed to just one rate for everything, but I'm not there yet). Is there a calculator out there that allows me to put in the amount charged to one rate, the rate, and the amount charged to the second rate and the second rate, then tell me based on that and my payment amount how long it will take me to pay off my credit card? You're AWESOME thanks. I'm about to leave for the weekend - 4 day holiday. And my question has only been open for 3 hours. I don't have internet connection at home, and it will go to voting before I get back. So PLEASE vote for yourself. If anyone else answers this question, please vote for the first guy who answered. Thanks!

Take for example a $ 100,000 @ 4% for 10 yrs would net what? After 10yrs the money would accumulate to approx $ 150,000 My question is if you are given the details (initial investment at a specific rate for a certain time period) is it possible to ballpark the amount increased ???