Calculating closing bank balance using credits and debits Steps:

• Opening balance is debit $600, equivalent to -$600 (overdraft).
• Add credits from cheque deposits: -$600 +$4200 = $3600 credit.
• Subtract debits from direct debit: $3600 -$180 = $3420 credit.
• Provided transactions yield $3420 credit balance, not matching any choice.

Why A is correct:

• Not enough information; calculated balance $3420 credit differs from all options, suggesting missing transactions (e.g., additional debits like cheques paid).

Why the others are wrong:

• B: $870 debit ignores net credit from deposits exceeding opening overdraft plus debit.
• C: $270 credit understates net addition of$4020 to opening -$600.
• D: $270 debit fails to account for large credit from deposits.

Final answer: Not enough information.