Question

In 2010, the population of a city was 236,000. From 2010 to 2015, the population grew by 7.4%. From 2015 to 2020, it fell by 6.6%. How much did the population decrease from 2015 to 2020, to the nearest 100 people?

Answer 1

the population decreased by 0.8%

You subtract 7.4% and 6.6% and you'll get 0.8% which is already rounded to 100.

Answer 2

To find the population of the city in 2015, we need to multiply the population in 2010 by the growth rate from 2010 to 2015.

236,000 * 1.074 = 252,944

The population in 2015 was 252,944.

To find the population of the city in 2020, we need to multiply the population in 2015 by the growth rate from 2015 to 2020.

252,944 * 0.934 = 236,328

The population in 2020 was 236,328.

To find the difference between the population in 2020 and the population in 2015, we can subtract the population in 2020 from the population in 2015.

252,944 - 236,328 = 16,616

The population decreased by 16,616 from 2015 to 2020. To the nearest 100 people, the population decreased by 16,600 people