Question

how did assumption of Diwani benefit the East India Company

Answer 1

They can collect the taxes and didn't submit it to the king... It made them powerful..

Answer 2

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The Diwani allowed the company to exploit the vast revenue resources of Bengal. Although its trade had expanded, it had to buy most of the goods in India with gold and silver imported from Britain. The overflow of Gold from Britain stopped after the assumption of Diwani. Now revenue from India could finance company expenses. These revenues they used to purchase cotton and silk textile in India, maintain company troops and meet the cost of building the company fort and offices at Calcutta.