(a) Income of all the rich people of the country
(b) Income of all industrialists of the country
(c) Income of all the agriculturists in the country
(d) Income of all the people in the country during a year
(a) Income of all the rich people of the country
(b) Income of all industrialists of the country
(c) Income of all the agriculturists in the country
(d) Income of all the people in the country during a year
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