At the month end, a business bank statement showed a credit balance of $12697. This did not agree with the cash book balance. The following differences were found. 1 A cheque received, $7170, was entered as $7710 in the cash book. 2 A cheque paid in, $2400, had not been cleared by the bank. 3 A standing order, $450, was recorded in the cash book but had not been paid by the bank. 4 Bank interest payable of $642 had not been entered in the cash book. What was the cash book balance before the necessary corrections were made?