Hi i am an indian national. i want a 15 days stay in hongkong.

I heard that Chungking mansion located on Nathan Road in Tsim Sha Tsui offered many cheap guest houses at a very lower price, but the encironment is rather poor and the most important is that it's not safe ro stay there.

It's hard to say the total expense for a 25 -duration in Hk. It depends where you will stay and what you will eat for each meal. However, the Hk immigration requires that you must have enough money in your bank account to cover your stay in Hk when you enter Hk. I think the standard account they require will be enough for you in Hk.