Answer :
In 2000 population = 2.2 e(0.006*0) = 2.2 millions
when its doubled this = 4.4 so we have
4.4 = 2.2e^(0.006t)
e^(0.006t) = 2
0.006t = ln 2
t = ln 2 / 0.006 = 116
population will double in year 2116
when its doubled this = 4.4 so we have
4.4 = 2.2e^(0.006t)
e^(0.006t) = 2
0.006t = ln 2
t = ln 2 / 0.006 = 116
population will double in year 2116