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  4. The population of a city increased at the rate of 20 % every year for the last three years. If the present population is 203,904 , then what was the population of the city 3 years ago?

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Q. The population of a city increased at the rate of $20 \%$ every year for the last three years. If the present population is 203,904 , then what was the population of the city 3 years ago?

Percentages

Solution:

(i) Let the original population be $x$ and proceed.
(ii) Use depreciation formula, $A=P(1+\frac{R}{100})^n$, where $A=203,904, R=20$ and $n=3$ years. Find $p$.