@Override   
   public BigDecimal calculateTotalSaleTax(ShoppingBakets<ConcreteItem> itemList){
	   BigDecimal totalSaleTax = new BigDecimal(0.00);
	   for(ConcreteItem item:itemList){
		   totalSaleTax = calculateSaleTax(item).add(totalSaleTax);
	   }
	   return totalSaleTax;
   }