static void Main(string[] args)
{
SimpleInterest oSI = new SimpleInterest(5000, 15.5, 3);
oSI.Calculate();
oSI.Display();
oSI = null;
CompoundInterest oCI = new CompoundInterest(5000, 15.5, 3, 4);
oCI.Calculate();
oCI.Display();
oCI.DeductServiceCharge(250);
oCI.Calculate();
oCI.Display();
oCI = null;
Console.WriteLine("Press a key...");
}