I don't understand why I got it wrong.

The following data were accumulated for use in reconciling the bank account of Mathers Co. for July: 1. Cash balance according to the company's records at July 31 $21,350. 2. Cash balance according to the bank statement at July 31, $22,600. 3. Checks outstanding, $4,330. 4. Deposit in transit, not recorded by bank, $3,480. 5. A check for $270 in payment of an account was erroneously recorded in the check register as $720. 6. Bank debit memo for service charges, $50. a. Prepare a bank reconciliation, using the format shown in Exhibit 14. Mathers Co. Bank Reconciliation July 31 22,600 Cash balance according to bank statement ) Add deposit in transit, not recorded by bank 3,480 Deduct outstanding checks 4,330 Adjusted balance 21,750 21,350 Cash balance according to company's records Add bank service charge X 50 x Dedcut error in recording check 450 X Adjusted balance 20,950 X