suspense account and correction of errors

I assume that you are asking what the correcting entries are!!
(although I don’t understand why you do not have the answer in the same book in which you found the question!!!)

The discount allowed should have been debited to discount allowed – not credited to discount received.

Therefore: DR discount allowed 3840 (to put in the correct entry)
DR discount received 3840 (to remove the wrong entry)
CR suspense account 7680 (the total)

The discount received should be credited to discount received – not debited to discount allowed.

Therefore: CR discount received 2960 (to put the correct entry)
CR discount allowed 2960 (to remove the wrong entry)
DR Suspense account 5920 (the total)

If you want (depending on the choices in the question), then the net entry to each account is as follows (just totalling up the entries on each account)

DR discount allowed 880 (3840 – 2960)
DR discount received 880 (3840 – 2960)
CR Suspense account 1760 (7680 – 5920)

sahe: Why on earth have you just repeated the answer that I had already typed out?!!!