Mumbai generates 5 % of India 's GDP . It accounts for 25 % of industrial output , 40 % of sea trade , and 70 % of capital transaction to India 's economy . Mumbai is the commercial and entertainment capital of India , generating 5 % of India 's GDP , and accounting for 25 % of industrial output , 70 % of maritime trade in India ( Mumbai Port Trust & JNPT ) , and 70 % of capital transactions to India 's economy .