Instance Methods

Methods are functions defined inside a class. They always take self as the first parameter.

class BankAccount:
    def __init__(self, balance):
        self.balance = balance
    
    def deposit(self, amount):
        self.balance += amount
    
    def get_balance(self):
        return self.balance
account = BankAccount(100)
account.deposit(50)
print(account.get_balance())  # 150

Your Task

Add a method apply_tax to the Expense class that: