using System;

public class Program

{

    public static void Main()

    {

        int unitNumber,idNumber;

        string custName;

        double chargePUnit = 0, amntCharged = 0, surchageAmounnt = 0, netAmount = 0.0;

        Console.Write("Customer IDNO : ");

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

        Console.Write("Customer Name : ");

        custName = Console.ReadLine();

        Console.Write("Unit Consumed : ");

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

        if(unitNumber <= 199)

        {

            chargePUnit = 1.20;

        }

        else

            if(unitNumber >=200 && unitNumber < 400)

            {

                chargePUnit = 1.50;

            }

        else

            if(unitNumber >=400 && unitNumber < 460)

            {

                chargePUnit = 1.80;

            }

        else

            if(unitNumber >=600)

            {

                chargePUnit = 2.00;

            }

        amntCharged = unitNumber * chargePUnit;

        Console.WriteLine("Amount Charges @R" + chargePUnit + "  per unit : " + amntCharged);

        if(amntCharged >= 400)

        {

            surchageAmounnt = amntCharged * 15/100;

        }

        Console.WriteLine("Surchage Amount : " + surchageAmounnt);

        netAmount = amntCharged + surchageAmounnt;

        Console.WriteLine("Net Amount Paid by the customer : " + netAmount);

​

    }

}