Give the rectifiying entries of the following:
(i) Sales of ₹ 20,000 to Manoj were recorded as ₹ 2,000 in the Sales Book.
(ii) An amount of ₹ 25,000 spent for the extension of machinery has been debited to the Wages Account.
(iii) Total of Sales Return Book was undercast by ₹ 4,750.
(iv) Goods of ₹ 3,000 sold to Mahesh were recorded in the Purchases Book.