Trial Balance and Rectification of Errors

Rectify the following errors:
(a) Credit Sales to Mohan ` 7,000 were recorded in purchases book.
(b) Credit Purchases from Rohan ` 9,00 were recorded in sales book.
(c) Goods returned to Rakesh ` 4,000 were recorded in the sales return
book.
(d) Goods returned from Mahesh ` 1,000 were recorded in purchases return
book.
(e) Goods returned from Nahesh ` 2,000 were recorded in purchases book.