public static void Main()
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 >=200 && unitNumber < 400)
if(unitNumber >=400 && unitNumber < 460)
amntCharged = unitNumber * chargePUnit;
Console.WriteLine("Amount Charges @R" + chargePUnit + " per unit : " + amntCharged);
surchageAmounnt = amntCharged * 15/100;
Console.WriteLine("Surchage Amount : " + surchageAmounnt);
netAmount = amntCharged + surchageAmounnt;
Console.WriteLine("Net Amount Paid by the customer : " + netAmount);