Solution:Dadabhai Naoroji was the first to estimate National Income of India in 1867-68. According to his estimates the Per Capita Income of India was Rs. 20 at that time. Per capita income (PCI) or total income measures the average income earned per person in a given area (city, region, country, etc.) in a specified year.It is calculated by dividing the area's total income by its total population. PCI compares and assesses the economic situations of countries with varying population sizes.
The measurement of a country's per capita income is done by dividing the total national income of a particular country or state by the population in that specific geographical region.
When calculating a country's PCI, every individual is taken into account. The calculation includes men, women, children, and babies. This is mainly because the measurement considers the entire country's population or specific geographical location