Question

The population of a village is 10000. If the population increases by 10% in the first year, by 20% in the second year, and due to mass exodus, it decreases by 5% in the third year, what will be its population after 3 years ?

• A. 10,540
• B. 11,540
• C. 12,540
• D. 13,540

Answer 1

The correct option is C 12,540

Population after 3 years $=10000(1+\frac{10}{100})(1+\frac{20}{100})(1-\frac{5}{100})$
$=10000\times \frac{11}{10}\times \frac{6}{5}\times \frac{19}{20}=12540$