Marin Company's general ledger indicates a cash balance of $22,340 as of September 30, 2018. Early in October Marin received a bank statement indicating that during September Marin had an NSF check of $1,500 returned to a customer and incurred service charges of $45. Marin also learned it had incorrectly recorded a check received from a customer on September 15 as $500 when in fact the check was for $550. Calculate Marin's correct September 30, 2018, cash balance.