How Do I calculating HRA, DA, PF, gross salary of an employee using his basic salary.in c#

using System;

class abc
{
    double bs, hra, da, pf, gs;
    public void sal()
    {
        Console.WriteLine("Basic salary of employee : ");
        bs = Convert.ToDouble(Console.ReadLine());
        Console.WriteLine("HRA of employee in %age : ");
        hra = (bs * (Convert.ToDouble(Console.ReadLine()))) / 100;
        Console.WriteLine("DA of employee in %age");
        da = (bs * (Convert.ToDouble(Console.ReadLine()))) / 100;
        Console.WriteLine("His pf in %age ");
        pf = (bs * (Convert.ToDouble(Console.ReadLine()))) / 100;
        gs = bs + (hra + da) - pf;
        Console.WriteLine("His hra is : " + hra);
        Console.WriteLine("His da is : " + da);
        Console.WriteLine("His pf is : " + pf);
        Console.WriteLine("His gross salary is : " + gs);
        Console.ReadKey();
    }
}
class salary
{
    public static void Main(string[] args)
    {
        abc a = new abc();
        a.sal();
    }

}
Output: