Payment Calculator

Hi guys,

I'm developing the following calculator at http://centenary.thermosis.com/v2/home-search.html

Click one of the three groups of cars to view the options.  I need to know how I can calculate the Max price someone can afford after they choose an Interest Rate.  This is a basic calculator but I'm not sure how to work out the max amount.

This calculator does exactly what I'm talking about:

http://www.timevalue.com/products/tcalc-financial-calculators/car-affordability-calculator.aspx?PAYMENT=%241000.00&DOWNPAYMENT=&TRADEIN=&LOANTERM=5&LOANTERM_UNITS=Years&INTERESTRATE=10.000+%25&SHOWAMORTIZATIONSCHEDULE=on&COMPUTE=COMPUTE&CALCULATORID=PC01&HIDEFORMTAG=TRUE&TEMPLATE_ID=www.timevalue.com_1&PostBack=true

This does it in reverse using javascript: http://www.aussiecarloans.com.au/loan-calculator.html

At this point I don't need a "Down payment", "Trade in value" or "Balloon/Residual" field.  I just want to work out how much someone can afford based on Interest Rate, Time Period, and Installment Amount fields.

Thanks!
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