Example: Number of Periods for an Investment

Someone obtains a $20,000 loan at 7.25% to buy a car. They want to make $350 a month payments. Here, the number of payments necessary to pay off the loan is computed. 
using System;
using Imsl.Finance;

public class nperEx1
{
    public static void  Main(String[] args)
    {
        double rate = 0.0725 / 12;
        double pmt = - 350.0;
        double pv = 20000;
        double fv = 0.0;
        double nperiods;
        nperiods = Finance.Nper(rate, pmt, pv, fv, 
                                Finance.Period.AtBeginning);
        Console.Out.WriteLine("Number of payment periods = " 
                              + nperiods);
    }
}

Output

Number of payment periods = 69.7805113662826
Link to C# source.