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?
Answer & explanation
Correct answer: option 3
Let present population = 100x
According to question ,
Increased Population
= \(\frac{100+10}{100}\) × \(\frac{100+15}{100}\) × \(\frac{100-10}{100}\) × 100x
= \(\frac{110}{100}\) × \(\frac{115}{100}\) × \(\frac{90}{100}\) × 100x
= 113.85x
Percentage increase in population = \(\frac{113.85x}{100x}\) × 100
= 13.85%