Question

The population of a small locality was $4000$ in $1979$ and $4500$ in $1981$, by what percent had the population increased?

Answer 1

Step : Finding the percentage of population increased

Given, population of a small locality in $1979=4000$.
Population of a small locality in $1981=4500$.
So, increase in population $=4500-4000=500$.

Increase $\%=\frac{\text{Increase in population}}{\text{Original population}}\times 100\%$

$=\frac{500}{4000}\times 100\%$

$=\frac{50}{4}=12.5\%$

Hence, the population of the locality increased by $12.5\%$.