In one year, the population, of a village increased by 10% and in the next year, it decreased by 10%. If at the end of 2nd year, the population was 7920, what was it in the beginning?
Q1. In one year, the population, of a village increased by 10% and in the next year, it decreased by 10%. If at the end of 2nd year, the population was 7920, what was it in the beginning?
Answer: 8000
Explanation: After a 10% increase then 10% decrease, the net factor is 0.99; so original population = 7920/0.99 = 8000.