how to generate exact pmt value in perl code as excel formula ?

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I tried using Finance::Amortization Perl library for generating pmt value but it do not match what i can get in excel sheet .

my perl code is like this :

my $am = Finance::Amortization->new(principal => ($total_invest), rate => (0.005), periods => 360 , compounding => 1, precision => 2);
        $pmt = $am->payment();

Posted 30-Oct-15 8:39am

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ZurdoDev 31-Oct-15 21:49pm

Different libraries may not match exactly. What is the answer you get in perl and what answer do you get in Excel?

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cookieburner · Answer 1 · 2015-11-01T01:25:00

i solved this problem as it is supposed to take 5% interest rate .
rate should be .05 instead of .005 .

different simulations of this Finance::Amortization formula now giving same result as we can get in excel pmt formula ..

still i need how to program pmt formula self in a perl script ?
it should recursively sumup self and should give future value / present value as well as loan amount ( pmt ) .
i need very simple example for pmt formula in perl coding .