Dear Ramesh, thanks for asking this question. I think it is one of the frequently asked question on the hubpages forum, google searches, and expert discussion forums. Actually no one can predict the amount of earning. The people or organization come up with several supportive document, turn up for their own promotional purposes.
Not going in much details, I would like to request you to read this topic:
(please write feedback. I want to develop it for peoples help in online earning on the hubpages.)
Please note, google is now allowing adsense account to the bloggers in the Asian countries. Only if you have a personal domain (provided that your site is up on the internet and its running), then only google will permit an adsense account.
So what is the best method for your, for now?
Join the 'Hubpages Ad Program'. To activate this, you only need a paypal account.
That's been the suggestions from my desk.
You may keep in touch and ask me your questions.