Rainey Company's true cash balance at October 31 is $5,710. The following information is available for the bank reconciliation:

• Outstanding checks, $600
• Deposits in transit, $450
• Bank service charges, $90
• The bank had collected an account receivable for Rainey Company, $1,000
• The bank statement included an NSF check written by one of Ramsey's customers for $600.

What was the unadjusted book balance at October 31?