Population 820 quake increases an annual rate of 22% so what will the approximate population be after 3 years?

The general form of exponential function ⇒⇒
Where: a is the initial value and b is the rate
b > 1 ⇒⇒ exponential growth or exponential increase
b < 1 ⇒⇒ exponential decay or exponential decrease

Given:   The initial population = 820
The annual rate = 23% = 0.23
The total ration between the adjacent years = 1+0.23 = 1.23

So, the exponential function to model this population is 


After 3 years ⇒⇒⇒ x = 3
∴ ≈ 1,526

The correct answer is:
  ; 1,526

20y5 times 2 is 1010 times -2 is -20, plus y