In the Tinkathia system in Bihar, what part of the land was kept in trust for the cultivation of indigo?

Explanation

Under the Tinkathia system, the farmers of the Champaran region of Bihar were compelled to cultivate indigo on 3/20th of their land. At the invitation of Rajkumar Shukla of Champaran during the annual session of the Congress held in Lucknow in 1916, Mahatma Gandhi came to Champaran in April 1917. Later, the government was compelled to constitute the “Champaran Agrarian Inquiry Committee” or Champaran Inquiry Committee to survey the condition of the farmers, and Mahatma Gandhi himself was a member of this committee. On the recommendations of this committee, the government abolished the Tinkathia system and refunded 25 percent of the illegally collected money to the farmers.