First we need to find the growth rate
The exponential growth formula is
P=A e^rt
P population in 1997=42 million
A population in 1992=39 million
E constant
R growth rate ?
T time 5years (1997-1992)
Solve the formula for R
R= [log(p/A)÷log (e)]÷t
R=(log(42÷39)÷log(e))÷5
R=0.015
Now estimate the population in 2009 using the same formula
P=A e^rt
P ?
A 42 million
R 0.015
T 12 years (2009-1997)
E constant
P=42×e^(0.015×12)
P=50.28 million round your answer to get 50 million
