Given that at 31 Dec 2010 , C Hui business : bank statement showed an overdraft of $412750 but the cash book showed a credit balance of $393265 at bank.
(i)A debt of $3900 previously written off as bad was repaid on 28 Dec 2010 with a cheque dated 10 Jan 2011. This had been entered in the cash book.
show the cash book balance as at 31 dec 2010
why the ans is credit the cash book by $3900.