Correct Answer - Option 4 : 109744
Population of the city 3 years ago = P = 128000 and n = 3
And, the decreasing percentage = R = 5%
The present population = P x (1 - R/100)n
= 128000 x (1 - 5/100)3
= 128000 x 19/20 x 19/20 x 19/20
= 16 x 6859 = 109744.