The population of a city increases at the rate of 10% per annum. If the population of the city was 2 crore in 2018, then the population of the city in the year 2021 was:
Answer & explanation
Correct answer: option 3
Population of city in 2018 = 2 crore
According to question ,
Population of city in 2021 ,
= \(\frac{100+10}{100}\) × \(\frac{100+10}{100}\) × \(\frac{100+10}{100}\) × 2
= \(\frac{11}{10}\) × \(\frac{11}{10}\) × \(\frac{11}{10}\) × 2
= 2.662 crore
So , population in 2021 is 2.662 crore.