Well, in dollars the average budget comes out to about 5000-7000 . But you can find both more expensive and cheaper, by the way, in the way I like to read https://8worldsnews.com/category/money/ - quite interesting news, and there are a lot of different categories.
Totally depends on the type of place you chose to stay. They have low budget to high budget accommodation options for you to choose from. The airfare can be around 30k from Mumbai (return). The remaining will be your cost of stay and food.