The percentage of import and export that were restricted to be between India and Britain was 0.5 or 50%.

Explanation:
During the colonial period, India was under British rule and trade between India and Britain was heavily regulated. The British government imposed restrictions on Indian trade and commerce, which included restrictions on the types of goods that could be imported and exported, as well as restrictions on the ports that could be used for trade.

Under the British Raj, India was primarily an exporter of raw materials such as cotton, jute, tea, and opium. These raw materials were sent to Britain, where they were processed and manufactured into finished goods. The finished goods were then sold back to India at a higher price.

The percentage of import and export that were restricted to be between India and Britain was 50%. This means that half of India's trade was restricted to be with Britain. The other half of India's trade was with other countries, such as China, the United States, and other European countries.

The restrictions on Indian trade with Britain were a major cause of economic hardship for the Indian people. The British government forced India to buy British-made goods at high prices, which led to a drain on India's resources and a decline in the standard of living for the Indian people.

In conclusion, the percentage of import and export that were restricted to be between India and Britain was 50%. This restriction had a significant impact on India's economy and was a major cause of economic hardship for the Indian people during the colonial period.