Question

The population of a town increases at the rate of 20% during one year and it decreases at the rate of20% during the second year. If it has 57,600 inhabitants at present, find the number of inhabitants two years ago.​

Answer 1

Let the population two years ago be = x

According to the question, 38400=1.20×0.80×x

x=

0.96

38400

=40,000

Hence, population two years ago was 40,000.