Answer:
B
Step-by-step explanation:
20 times 5 is 100. We can multiply 2*5 and get 10, then add another zero to make it easier.
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
At the end of 2011, the population was