Question

The population of a town increased by 10% per year in 2009, 2010, and 2011. If the population of the town at the beginning of 2009 was 40,000, what was it at the end of 2011?

Answer 1

If the population was 40,000 at the beginning of 2009, at the end of 2009 it has increased by 10% and became 44,000.

By the same way, at the end of 2010, it became $44000 + \frac{44000*10}{100} = 48400$

At the end of 2011, the population was $48400 + \frac{48400 * 10}{100} = 53240$