Compute the regular payments for a loan using decimal values in CSharp

//from   w w  w.j a v a  2 s .co  m
using System; 
 
public class RegPay {    
  public static void Main() {    
    decimal Principal;    // original principal 
    decimal IntRate;      // interest rate as a decimal, such as 0.075 
    decimal PayPerYear;   // number of payments per year 
    decimal NumYears;     // number of years 
    decimal Payment;      // the regular payment 
    decimal numer, denom; // temporary work variables 
    double b, e;          // base and exponent for call to Pow() 
 
    Principal = 10200.00m; 
    IntRate = 0.0175m; 
    PayPerYear = 112.0m; 
    NumYears = 15.0m; 
 
    numer = IntRate * Principal / PayPerYear; 
  
    e = (double) -(PayPerYear * NumYears); 
    b = (double) (IntRate / PayPerYear) + 1; 
 
    denom = 1 - (decimal) Math.Pow(b, e); 
     
    Payment = numer / denom; 
 
    Console.WriteLine("Payment is {0:C}", Payment); 
  }    
}