I have PV, PMT and N. I want get I (Tax).
Please, if I'm not clear, help me adjust this Question. I don't know nothing about Financial Math. I'm programmer, I need get something like TIR function of Excel and recreate in Python. I just want the instruction.
Example
PV = 1.000
PMT = 80
N = 24
I = ????
The expected value of I is: 8.6%