The population of a town increases at a rate of 10% for every year. If the present population is 12100, find the population two years ago.
Answer & explanation
Correct answer: option 3
Formulae of net effect:
x + y + \(\frac{xy }{100 }\)
10 + 10 + \(\frac{100 }{100 }\) = 21%
According to question,
Population at present (after increase of 10% every year) = 12100
Population 2 years ago = \(\frac{12100 }{121 }\) x 100 = 10000