Given details are,
Present population is = 25000
First year growth R1 = 4%
Second year growth R2 = 5%
Third year growth R3 = 8%
Number of years = 3
By using the formula,
A = P (1 + R/100)n
So, population after three years = P (1 + R1/100) (1 + R2/100) (1 + R3/100)
= 25000(1 + 4/100) (1 + 5/100) (1 + 8/100)
= 25000 (1.04) (1.05) (1.08)
= 29484
∴ Population after 3 years will be 29484.