In preparing its 8/31/X1 bank reconciliation, Apex Corp. has available the following information: Balance per bank statement, 8/31/X1 $18,050 Deposit in transit, 8/31/X1 3,250 Return of customer's NSF check, 8/31/X1 600 2,750 Outstanding checks, 8/31/X1 Bank service charge for August I 100 The correct cash balance at 8/31/X1 is