Question

The population of a town increased by 15% in 2018 and 10% in 2019, Due to a pandemic, it decreased by 10% in 2020. What was the percentage increase in the population of the town in 3 years?
1. 15%
2. 12.5%
3. 17.5%
4. 13.85%

Answer 1

Correct Answer - Option 4 : 13.85%

Given:

% population increased in 2018 = 15%

Calculation:

Let initial population be a.

Total population after 3 years = a × 115/100 × 110/100 × 90/100 = 1.1385a

∴ Required percentage increase = (1.1385a - a)/a × 100 = 13.85%