Answer: D
Population in a small town last year = 50000
Population in a small town after one year = 63750
Increase in population = 63750 - 50000 = 13750
Therefore,
percentage increase in population = Increase in population/Last year population × 100 %
= 13750/50000 × 100
= 1375000/50000
= 27.5%
Thus, the increase in population is 27.5%