using System;

public class Program

{

    public static void Main()

    {

        int custID=0;

        string name="";

        double unitCharg = 0;

        int unitCons=0;

        double amouChrg=0;

        double surAmt=0;

        double netAmt=0;

        Console.WriteLine("Expected output: ");

        Console.WriteLine("Customer IDNO :");

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

        Console.WriteLine("Customer Name :");

        name=(Console.ReadLine());

            Console.WriteLine("unit Consumed : ");

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

            if(unitCons <=199 && unitCons<200)

            {

                unitCharg=unitCharg+1.20;

                amouChrg=Convert.ToDouble((unitCons*unitCharg));

            }

            else

                if((unitCons <=200 && unitCons<400))

                   {

                            unitCharg=unitCharg+1.50;

                            amouChrg=Convert.ToDouble((unitCons*unitCharg));

                   }

                else

                if((unitCons <=400 && unitCons<600))

                   {

                            unitCharg=unitCharg+1.80;

                            amouChrg=Convert.ToDouble((unitCons*unitCharg));

                   }

                else

                    if(unitCons>=600)

                       {    unitCharg=unitCharg+2;

                            amouChrg=Convert.ToDouble((unitCons*unitCharg));

                       }

            if(amouChrg>=400)

            {

                surAmt=amouChrg*0.15;

            }

        netAmt=amouChrg+surAmt;

        Console.WriteLine("Amount Charges :"+"@  R"+unitCharg+" per unit :R"+amouChrg);

        Console.WriteLine("Surchage Amount :R"+surAmt);

        Console.WriteLine("Net Amount Paid By the Customer :R"+netAmt);

    }

}