How will be the following errors rectified?
(i) Purchases Book is overcasted by Rs 10,000.
Purchases Return Book is overcasted by Rs. 1,000.
(ii) Purchases Return Book's balance is carried forward in excess by Rs. 100.
(iv) Purchases Books' balance is carried forward in excess by Rs. 1,000.
Note: The above errors have been detected before the preparation of Trial Balance.