static void Main(string[] args)
{
const int hours = 50, wage = 70;
Employee emp = new Employee();
emp.CalculateWeeklySalary(hours, wage); // Polymorphism
Contractor cont = new Contractor();
cont.CalculateWeeklySalary(hours, wage); // Polymorphism
Console.WriteLine("Press any key to continue ..........");
Console.ReadKey();
}