Abu, a debtor to Dania, owed ₦10,500 at the start of the month. He paid cash of ₦40,005 during the month and received additional credit sales of ₦20,000.Using the information, Abu's balance at the end of the month is

• A.₦30,505 cr.
• B.₦9,505 cr.
• C.₦9,505 dr.
• D.₦30,500 dr.