Question

In 2010, the population of a city was 191,000. From 2010 to 2015, the population grew by 3.9%. From 2015 to 2020, it fell by 3.3%. To the nearest 100 people, what was the population in 2020?

Answer 1

The population by 2020 is 191,900

Explanation:

Given that;

population 2010 (population in 2010): 191000

the population grew from 2010 to 2015: by 3.9%

so, population by 2015 =
`191000(1 + (3.9)/(100))`

=
`191000(1 + 0.039)`

=
`191000(1.039)`

=
`198449`

the population drop from 2015 to 2020: 3.3%

so, population by 2015 =
`198449(1 - (3.3)/(100))`

=
`198449(1 - 0.033)`

=
`198449(0.967)`

=
`191,900.183`