[Plugin: CalculatorPro Calculators] Auto Loan Calculator always answers $0.00

It doesn’t matter what numbers I enter in the boxes for loan amount, term, and interest rate, the Auto Loan Calculator (calc id=1771) always returns an answer of $0.00.

I tried a few of the other calculators (Celsius to Fahrenheit, centimeters to inches, circumference of a circle) and those all work so it’s not a problem with the plugin as a whole.

Anyone have an idea why the Auto Loan Calculator doesn’t like me?

http://wordpress.org/extend/plugins/calculatorpro-calculators/