opulation scale is written in billions of people, the numeric population values are $2\mathrm{.}0{10}^9$ people in $1925$ and $6\mathrm{.}0{10}^9$ people in $2000.$ Therefore, you can calculate the difference by subtracting the smaller value from the larger value: change $in$ population $=6\mathrm{.}0{10}^9-2\mathrm{.}0{10}^9=4\mathrm{.}0{10}^9$ people Part D What is the average rate of increase in population per year over this time $($from $1925$ to $2000)?$ Express the average rate of increase based on the number of people per year to two significant figures. View Available Hint$($s$)$ Hint $1.$ How to approach the problem Hint $2.$ Identify how to calculate an average rate $(7.$ The correct answer does not depend on: $x10.$ No credit lost. Try again.