VB “Financial.Pmt” equivalent in C#?

Question

There is a built in function from the Microsoft.VisualBasic assembly. I can use it in VB like this:

Financial.Pmt((dAPR / 100) / 12, iNumberOfPayments, dLoan         


        

Answer 1

For those who don't like to import VB functions. Here's pure C# code for PMT

public static double PMT(double yearlyInterestRate, int totalNumberOfMonths, double loanAmount)
{
    var rate = (double) yearlyInterestRate / 100 / 12;
    var denominator = Math.Pow((1 + rate), totalNumberOfMonths) - 1;
    return (rate + (rate/denominator)) * loanAmount;
}

Usage:

PMT(7, 360, 120000);
// Result: 798.36
PMT(4.5, 360, 137500.47);
// Result: 696.69
PMT(4.13, 360, 61520);
// Result: 298.33
PMT(6.38, 360, 89200);
// Result: 556.78