Question

In 2010, the population of a city was 193,000. From 2010 to 2015, the population grew by 5%. From 2015 to 2020, it fell by 4%. How much did the population decrease from 2015 to 2020, to the nearest 100 people?

Answer 1

To calculate the population decrease from 2015 to 2020, we need to find 4% of the population in 2015 and subtract that value from the 2015 population

Population in 2015 = 193,000 + 5% (growth from 2010 to 2015)
Population in 2015 = 193,000 + (0.05 * 193,000)
Population in 2015 = 193,000 + 9,650
Population in 2015 = 202,650

Population decrease from 2015 to 2020 = 4% of the population in 2015
Population decrease from 2015 to 2020 = 0.04 * 202,650
Population decrease from 2015 to 2020 = 8,106

Rounding to the nearest 100 people, the population decrease from 2015 to 2020 is approximately 8,100 people