Adding VAT

class Article:
    def __init__(self, base_price, quantity):
        self.base_price = base_price
        self.quantity = quantity

    def add_vat(self, current_vat_as_float):
        return self.base_price * (1 + current_vat_as_float)

item_one = Article(1000.00, 100)

print("Total:", item_one.add_vat(0.2))

# Total: 1200.0