Answer:
The world population will be 11.64 billions in 21 years.
Step-by-step explanation:
Initial population = 8 billion
Growth rate = 1.8% per year =0.018
Time = 21 years
We are supposed to find what will the world population be in 21 years
Formula : [tex]y = a (1+r)^t[/tex]
y = population after t years
r = rate of interest in decimals
t = time in years
Substitute the values :
[tex]y =8(1+0.018)^{21}[/tex]
[tex]y =11.635[/tex]
Hence the world population will be 11.64 billions in 21 years.
