Question

The population in a small town increases from 4000 to 4125 in one year. What is the percentage increase in the population?

• A. $3.25$
• B. $3.5$
• C. $3.125$
• D. $3.215$

Answer 1

The correct option is C $3.125$

Population in the small town last year
$=4000$

Population in the small town after one year
$=4125$

Increase in population
$=4125-4000$
$=125$

Therefore,
percentage increase in population $=\frac{\text{Increase in population}}{\text{Last year's population}}\times 100$

$=\frac{125}{4000}\times 100$

$=\frac{12.5}{4\times 100}$

$=\frac{3.125}{100}$
$=3.125$%

Thus, the increase in population is 3.125%