Implement bank balance operations

Q: Implement bank balance operations

This question evaluates object-oriented programming, state management, input validation, and arithmetic correctness when implementing account operations and maintaining transactional invariants.

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Design and implement a Bank account class that supports the operations Deposit(amount), Withdraw(amount), and CashBack(percent). Ensure balance updates correctly, prevent overdrafts, and return the updated balance after each operation.

Implement bank balance operations

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