Explanation:

- The per capita income of Rajasthan at constant prices (2011-12) for 2020-21 is the measure of average income earned per person in the state, adjusted for inflation to reflect constant purchasing power.

- Option 1: 79,722 – This figure is not the correct estimate for Rajasthan's per capita income at constant prices for the given year.

- Option 2: 97,227 – This amount is also not the correct estimate mentioned in the advance estimates.

- Option 3: 72,297 – This figure does not match the per capita income estimation for Rajasthan in 2020-21.

- Option 4: 75,527 – This is the correct estimate for the per capita income of Rajasthan at constant prices for the year 2020-21.