To calculate the population in 2016, we shall proceed as follows; population growth follows an exponential growth formula given by: f(t)=ae^(kt) where: f(t)=future population a=initial population k=constant of proportionality; suppose in 2011, t=0 and in 2016, t=5; k=11.5%=0.115, a=4.8 million thus the population in 2016 will be: f(t)=4.8e^(0.115t) thus; f(5)=4e^(0.115*5) =22.44 N/B the population is in millions thus; the population in 2016 will be: 22.44 million