The population of a town is 1771561. If it had been increasing at 10% per annum, its population 6 years ago was :

A. 1000000

B. 1100000

C. 1210000

D. 1331000

Answer: Option A

Solution(By Examveda Team)

Population of 6 years ago :
$$\eqalign{ & = \left[ {\frac{{1771561}}{{{{\left( {1 + \frac{{10}}{{100}}} \right)}^6}}}} \right] \cr & = 1771561 \times {\left( {\frac{{10}}{{11}}} \right)^6} \cr & = \frac{{1771561 \times 1000000}}{{1771561}} \cr & = 1000000 \cr} $$