Question 73

The population of a city increased by 30%in the first year and decreased by 15% in the next year. If the present population is 11.050 then the population 2 years ago was:

Solution

Let 2 years ago the population of a city be x.

Population after 1 year = x $$\times$$ \frac{130}{100}$$ = 1.3x

Population after 2 year = 1.3x $$\times$$ \frac{85}{100}$$ = 1.105x

11050 = 1.105x

x = 10000

The population 2 years ago was 10000.

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