Rectify the following errors:
(i) Sale of old furniture worth Rs. 3,000 treated as sales of goods.
(ii) Sales Book added Rs. 5,000 short.
(iii) Rent of proprietor's residence, Rs. 6,500 debited to Rent Account.
(iv) Goods worth Rs. 11,970 returned by Manav posted to his debit as Rs. 11,790.