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The IRR (Internal Rate of Return) of a stream of cash flows over time is an interest rate at which the NPV (Net Present Value) = 0.					
 If the stream of cash flows has > 1 sign reversal, then there may be multiple IRR's.					
What'sBest! does not support IRR,   however, it does support NPV.					
This can be used to compute IRR, by adding a constraint that NPV = 0.