Answer 1

Population after three years = P \[\left( 1 + \frac{R}{100} \right)^n \]
\[9, 261 = P \left( 1 + \frac{5}{100} \right)^3 \]
\[9, 261 = P \left( 1 . 05 \right)^3 \]
\[P = \frac{9, 261}{1 . 157625}\]
\[ = 8, 000\]
Thus, the population three years ago was 8, 000.