Hi Shaili, On an average your daily cost will be around INR 4,000 per day in Bahamas- (low budget travel). I have attached some stay options below, you can go through this link for more stay options as well.
https://www.tripoto.com/travel-guide/the-bahamas/hotels
Three nights at the British Colonial Hilton Nassau can cost as little as $471 per person, including flights, according to one Priceline deal. A full week on Paradise Island at the Riu Palace plus flights can go for $1,379 per person. And remember: Many of the islands' resorts and upper scale hotels are for adults only. Check Airbnb