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That the per capita income in India was Rs. 20 in 1867-68, was ascertained for the first time by

  1. (a)M. G. Ranade
  2. (b)Sir W. Hunter
  3. (c)R. C. Dutta
  4. (d)Dadabhai Naoroji
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Official answer(d) Dadabhai Naoroji