91Ó°ÊÓ

The formula for the annual rate of change of population is:

$\text{annualrateofchangeofpopulation}=\frac{\text{changeinpopulation}}{\text{changeintime}}$

It is given that in 1980, the population was$3.66$ million and in 2000, the population was$4.04$ million.

Therefore, it can be noticed that:

role="math" localid="1647755947894" $\begin{array}{c}\text{changeinpopulation}=(4.04−3.66)\text{million}\\ =0.38\text{million}\end{array}$

role="math" localid="1647755940818" $\begin{array}{r}\text{changeintime}=(2000−1980)\text{year}\\ =20\text{year}\end{array}$

Now substitute these values in the formula for the annual rate of change of population.

Therefore, it is obtained that:

$\begin{array}{r}\text{annualrateofchangeofpopulation}=\frac{\text{changeinpopulation}}{\text{changeintime}}\\ =\frac{0.38\text{million}}{20\text{year}}\\ =0.019\text{million/year}\end{array}$

Therefore, the annual rate of change in population from 1980 to 2000 was$0.019$ million/year.