class Bank: def init(self, name, balance): self.name = name self.balance = balance

def deposit(self, amount):
    self.balance += amount
    print(f"Deposited {amount} dollars. New balance is {self.balance} dollars.")

def withdraw(self, amount):
    if self.balance >= amount:
        self.balance -= amount
        print(f"Withdrew {amount} dollars. New balance is {self.balance} dollars.")
    else:
        print("Insufficient funds.")

class SavingsAccount(Bank): def init(self, name, balance, interest_rate): super().init(name, balance) self.interest_rate = interest_rate

def add_interest(self):
    interest = self.balance * self.interest_rate
    self.balance += interest
    print(f"Added {interest} dollars in interest. New balance is {self.balance} dollars.")

Example usage

savings_account = SavingsAccount("John", 1000, 0.05) savings_account.deposit(500) savings_account.add_interest() savings_account.withdraw(200)