Explanation:

Mumbai stands close to Delhi in terms on earning the highest GDP of USD 368 billion. Hence it is called the Financial capital. The Mumbai port has been welcoming since the visit of King George V and Queen Mary and stands as the significant point of entry from the West and so it is the Gateway of India. Lesser known fact, Mumbai was formed by uniting seven islands – the Isle of Bombay, Colaba, Old Woman’s Island, Mahim, Mazagaon, Parel and Worli; thereby the name.