using System;

public class Program

{

    public static void Main()

    {

        int customerid, conunit;

   double chg, surchg=0, gramt,netamt;

   string custName;

​

           Console.Write("\n\n");

           Console.Write("Calculate Electricity Bill:\n");

           Console.Write("----------------------------");

           Console.Write("\n\n");

​

   Console.Write("Input Customer ID :");

    customerid= Convert.ToInt32(Console.ReadLine());

   Console.Write("Input the name of the customer :");

   custName= Console.ReadLine();

   Console.Write("Input the unit consumed by the customer : ");

   conunit= Convert.ToInt32(Console.ReadLine());

   if ( conunit < 200 )

    chg = 1.20;

   else if ( conunit >= 200 &&  conunit < 400)

        chg = 1.50;

    else if ( conunit >= 400 &&  conunit < 600)

            chg = 1.80;

        else

            chg = 2.00;

   gramt =  conunit * chg;

   if (gramt > 300)

    surchg = gramt * 15 / 100.0;

   netamt = gramt + surchg;

   if (netamt  < 100)

    netamt =100;

   Console.Write("\nElectricity Bill\n");

   Console.Write("Customer IDNO                       :{0}\n",customerid);

   Console.Write("Customer Name                       :{0}\n",custName);

   Console.Write("unit Consumed                       :{0}\n", conunit);

   Console.Write("Amount Charges @Rs. {0}  per unit :{1}\n",chg,gramt);

   Console.Write("Surchage Amount                     :{0}\n",surchg);

   Console.Write("Net Amount Paid By the Customer     :{0}\n",netamt);

    }

}