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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%

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    $\begingroup$ The English name for TIR is IRR. But this seems to be a question about Excel, not mathematics. $\endgroup$ – Michael Greinecker Oct 3 '17 at 19:31
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    $\begingroup$ I is not tax, it is the interest rate! $\endgroup$ – alexjo Oct 3 '17 at 19:32
  • $\begingroup$ Yes, interest rate. compound interest rate $\endgroup$ – Guilherme IA Oct 3 '17 at 19:37

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