ajax2cel

I have multiple possible payment streams(PMT) against the Present Value(PV), so the rate function rate(NPER,PMT,PV) is going to work but the logic behind it will.

I want to see the code behind the RATE function in VB.net? Or, can anyone show me some sample code that could replace it? Thanks in advance for your help

I am using the "rate" function, however, it does not provide all of the functionality I need. Does anyone know how you could see the code behind one of these functions? Or