35 years
Step-by-step explanation:
The rule of 70 will be applied here as the growth is steady by some percentage. It is yearly growth in per-cent "/70 Knowing the doubling time for 2% from the chart it is easy to determine the years taken to double the population by the given rate.
Td (doubling time) at 2% is 35
Also,
dividing 70/2
= 35
So in 35 years the population will be double in 2 years at the rate of 2% increase.