Civil Engineering MCQAE Level Civil Engineering
In the geometric increase method for population forecasting, the population after n decades is:
Environmental EngineeringPopulation Forecast GeometricMEDIUM
Choose the correct answer
A
P_n = P_0 + n x (dP/dt)
B
P_n = P_0 x (1 + r/100)^n
C
P_n = P_0 + n x Ig
D
P_n = (P_0 + P_f)/2
Correct Answer
B. P_n = P_0 x (1 + r/100)^n
Why is this the answer?
Geometric (exponential) method: P_n = P0 x (1 + Ig/100)^n, where Ig = geometric growth rate per decade (%). Used for cities in growth phase. Arithmetic: P_n = P0 + n x Ia. Geometric gives higher projections; arithmetic is conservative.
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