The cost can vary.The lowest a Bali trip would cost (an all inclusive package i.e.hotel,sightseeing,flights) would be Rs 50-55,000.However if you modify your stay to a 4 or 5 star Villa for some days as well (along with a 4 or 5 star hotel for remaining few days) the tril cost would be somewhere aroung 60-65000 inr.