def twenty_percent_tax_calculation(self): twenty_percent_tax=[] total=[] for key,value in self.__item_price.items(): if value==20 and key in self.__name_items: twenty_percent_tax.append(key) return print(twenty_percent_tax)

This method calculates the items that have a 20% tax rate based on the item price and name. It then returns a list of those items.

If you want to calculate the total price of the items with a 20% tax rate, you can modify the method to sum up the prices of those items and return the total. Here's an updated version of the method:

def twenty_percent_tax_calculation(self):
    twenty_percent_tax_items = []
    total_price = 0
    
    for key, value in self.__item_price.items():
        if value == 20 and key in self.__name_items:
            twenty_percent_tax_items.append(key)
            total_price += self.__item_price[key]
    
    return twenty_percent_tax_items, total_price

This updated method will return a tuple containing the list of items with a 20% tax rate and the total price of those items.