Describe the process for transferring and withdrawing money, including any fees and balance checks.

Here are the answers for Question Four:

a) To Transfer Money:
To transfer money, the system should perform the following checks and actions:

• Prompt the user to enter the recipient's phone number, the transfer amount, and their personal identification number (PIN).
• Verify if the entered PIN matches the user's my_pin.
• Calculate the total amount to be deducted, which is the transfer_amount plus a 5% service fee. $$\text{Total Deduction} = \text{transfer\_amount} + (\text{transfer\_amount} \times 0.05)$$
• Check if the current_balance is greater than or equal to the Total Deduction.
• If all conditions are met, deduct the Total Deduction from the current_balance and confirm the transfer. Otherwise, display an error message (e.g., "Invalid PIN" or "Insufficient Balance").

b) To Withdraw Money:
To withdraw money, the system should perform the following checks and actions:

• Prompt the user to enter the withdrawal amount and their PIN.
• Verify if the entered PIN matches the user's my_pin.
• Calculate the total amount to be deducted, which is the withdrawal_amount plus a 5% service fee. $$\text{Total Deduction} = \text{withdrawal\_amount} + (\text{withdrawal\_amount} \times 0.05)$$
• Check if the current_balance is strictly greater than the Total Deduction.
• If all conditions are met, deduct the Total Deduction from the current_balance and confirm the withdrawal. Otherwise, display an error message (e.g., "Invalid PIN" or "Insufficient Balance").

c) To Deposit Money:
To deposit money, the system should perform the following checks and actions:

• Prompt the user to enter the deposit amount.
• Check if the deposit_amount is greater than 500.
• If the condition is met, add the deposit_amount to the current_balance. $$\text{current\_balance} = \text{current\_balance} + \text{deposit\_amount}$$
• Confirm the deposit. Otherwise, display an error message (e.g., "Deposit amount must be greater than 500").

d) To Check Account Balance:
To check the account balance, the system should perform the following checks and actions:

• Prompt the user to enter their PIN.
• Verify if the entered PIN matches the user's my_pin.
• If the PIN is valid, display the current_balance. Otherwise, display an error message (e.g., "Invalid PIN").

e) Three Chances for PIN:
The system should implement a counter for incorrect PIN attempts.

• Initialize a variable, for example, pin_attempts, to 0.
• Whenever a PIN is required (for transfer, withdrawal, or balance check), allow the user up to three attempts to enter the correct PIN.
• If an incorrect PIN is entered, increment pin_attempts.
• If pin_attempts reaches 3, the account should be locked, preventing further transactions until it is unlocked by an administrator or a recovery process.
• If the correct PIN is entered within three attempts, reset pin_attempts to 0 and proceed with the requested transaction.