Answer:
4.448 billion
Explanation:
What we must calculate is the proportion of increase in the period of 100 years, we know the one of 100 years ago and the current one, therefore we can calculate this increase.
Current population / Old population = 3.2 / 2.3 = 1.39
The increase is 1.39, which is equal to a 39% increase in the population.
Now to calculate how much it will be in 100 years, it would be to increase the current population by 39% and this will give us an estimate of this population in 100 years.
3.2 * 1.39 = 4.448
This means that the population within 100 years will be 4.448 billion