The following errors were detected before preparation of the trial balance. Rectify them.
(a) A sum of Rs 5,000 written off as depreciation on buildings has not been posted to depreciation account.
(b) Payment of wages Rs 2,000 to Venkat was posted twice to wages account.
(c) An amount of Rs 250 for a credit sale of goods to Nila, although correctly entered in the sales book, has been posted as Rs 200.