code: def getTotalPrice(self):
          
          price = self.getPrice()
          price = Decimal(price or '0.00')
          vat = Decimal(self.getVAT())
          vat = vat and vat / 100 or 0
          price = price + (price * vat)
          return price.quantize(Decimal('0.00'))
docs: compute total price