1)   Free Pay Down Debt or Invest Calculator 3.0
This free financial calculator helps you discover whether paying down your debt or investing a windfall is the better choice for you.
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 2)   Pay Down Debt or Invest Calculator 2.0.03
This free financial calculator for Windows helps you determine whether paying off debt or investing is your best option when you have a windfall.
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 3)   MoneyToys - Pay Down Debt or Invest applet 1.3
MoneyToys - Pay Down Debt or Invest? applet is designed to provide webmasters with a simple way to add instant interactivity to a web site. You can see the future effects of an investment compared to the future effects of using funds to pay down.
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