Question

One year, the population of a city was 201,000. Several years later it was 237,180.Find the percent increase.

Answer 1

To solve for the percent increase of a population:

`201000\longrightarrow237180`

New Population = 237,180

Old population = 201,000

`\begin{gathered} \text{percentage increase=}(new-old)/(old)*(100)/(1) \\ \text{ \%}increase=(237180-201000)/(201000)*(100)/(1) \end{gathered}`

To evaluate the percentage increase:

`\begin{gathered} \text{ \%increase=}\frac{\text{36180}}{201000}*(100)/(1) \\ \text{ \%increase=}\frac{\text{3618000}}{201000} \\ \text{ \%increase =18 \%} \end{gathered}`

Hence the percent increase = 18%