Description for Correct answer:
An year ago, let the population of village Q = x

Then, the presenet population of village P = 2x

Accordig to question,

\( 3528 = x \times \frac{120}{100} \times \frac{120}{100} \)

\( x = 2450 \)

\( = 2 \times 2450 = 4900 \)