/// <summary>
/// invoke calculate tax method within the taxCalculator class. assign returned value into Inherited TotalTaxAmount property.
/// </summary>
/// <param name="payee"></param>
public override void CalculateTax(Payee payee)
{
var taxCalculator = new TaxCalculator(); //create new instance of Type TaxCalculator.
TotalTaxAmount = Math.Round(taxCalculator.CalculateTax(payee), 2); //rounding the result into 2 decimal places.
}
