The closing balance should be $325,200. This can be calculated by adjusting the errors in the payables ledger control account. The correct closing balance is obtained by subtracting the incorrect contra amount of $4,200 and the incorrect purchases return amount of $17,400 from the given closing balance of $410,400. Therefore, the correct closing balance should be $410,400 - $4,200 - $17,400 = $388,800. Since the payables ledger control account has a debit balance, this amount should be deducted from the opening balance of $384,600. Therefore, the correct closing balance is $384,600 - $388,800 = -$4,200. However, since the question asks for the closing balance in dollars, the negative sign is ignored. Hence, the correct closing balance is $4,200.