Marin Companys general ledger indicates a cash balance of $23,640 as of September 30, 2021. Early in October Marin received a bank statement indicating that during September Marin had an NSF check of $2,800 returned to a customer and incurred service charges of $50. Marin also learned it had incorrectly recorded a check received from a customer on September 15 as $700 when in fact the check was for $760. Calculate Marins correct September 30, 2021, cash balance.