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class BankAccount: interest_rate = 0.03 # class variable — same for all def __init__(self, owner, balance=0): self.owner = owner # instance variable self.balance = balance def deposit(self, amount): self.balance += amount def add_interest(self): self.balance += self.balance * BankAccount.interest_rate acc = BankAccount("Alice", 1000) acc.deposit(500) acc.add_interest() print(f"{acc.owner}: ${acc.balance:.2f}")
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