Q.A country's National Income (NNP at Factor Cost) is Rs 2,40,000 crore and its population is 60 crore.

Per capita income divides national income by population; comparing two years shows whether income is growing faster than population. …

Using the formula $PCI = \dfrac{\text{National Income}}{\text{Population}}$:

(i) First year:

Independent check: $4{,}000 \times 60 \text{ crore} = 2{,}40{,}000 \text{ crore}$, which matches the given national income.

(ii) Second year:

Independent check: $4{,}375 \times 64 \text{ crore} = 2{,}80{,}000 \text{ crore}$, which matches. …

An alternative to comparing the rupee figures is to compare growth rates: national income rose $\tfrac{2{,}80{,}000 - 2{,}40{,}000}{2{,}40{,}000} \approx 16.7\%$ while population rose $\tfrac{64-60}{60} \a …

A common slip is mismatching units — since both figures are in 'crore', the crores cancel directly; converting one to absolute numbers first often introduces an arithmetic error. Another is concluding per ca …