The population of a town first decreased by 16% due to migration to a big city for better job opportunities. The next year, the population of the town increased by 21% as there were better facilities for jobs. What is the net percentage change (correct to 2 decimal places) in the population?

Correct option is C

Given:
Population decrease due to migration = 16%
Population increase thereafter =21%
Formula Used:
Successive increment or decrement of x% and y% are given then
Effective change = $$x + y +\frac{ xy}{100}$$​​
Solution:
Taking -16% and 21% percent
​$$= -16+21 +\frac{(-16\times21)}{100} \\\ \\= 1.64$$​​
Alternate Method:
For Effective change
​$$=100 \times \frac{((100-x))}{100}\times \frac{((100+y))}{100} \\\ \\= 100 \times \frac{84}{100} \times \frac{121}{100}= 101.64$$ 

= 1.64%