Solution :
a).
Cash account drawn $ 17600
To the fees earned is $ 8800
To the account receivable is $ 8800
(It is now rectified, being wrong entry made earlier)
b).
The accounts payable Dr 1760
To the supplies expenses is $ 1760
To supplies account Dr is 1760
Cash $ 1760
(It is now rectified, being wrong entry made earlier)