Question:The population of a city increases at the rate of `5%` annually. Its present population is `1,85,220`. Its population `3` years ago was : 

A `181500` 
B `183433` 
C `160000` 
D `127783` 

+ Answer
C 

+ Explanation
Population `3` years ago 

`= (185220)/(1 + (5/(100))^3`

`= (185220 xx (20)/(21) xx (20)/(21) xx (20)/(21))`

`=160000`.

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Md. Habib Ullah

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