Question

Wht is trade surplus. how was the income recieved from trade surplus with india used by britain

Answer 1

Trade surplus - the amount by which the value of a country's exports exceeds the cost of its imports is called trade surplus

Britain had a trade surplus with India.
The value of British exports to India was much higher than the value of British imports from India thus Britain had a trade surplus with India . Britain used this trade surplus to this surplus to balance its trade deficit with the countries from which it was importing more than it was selling to .

Answer 2

it means the amount by which the value of a country exports exceeds the cost of its  imports