the present population of a country estimated to be 10 crores is..., Percentage, General Mathematics

Question:The present population of a country estimated to be `10` crores is expected to increase to `13.31` crores during the next three years. The uniform rate of growth is :

A `8%` 
B `12.7%` 
C `10%` 
D `15%`

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+ AnswerC

+ Explanation`10 "crores" xx (1 + R/(100))^3`

`= 13.31 "crores"`.

`:. (1 + R/(100))^3`

`= (13.31 "crores")/(10 "crores")`

`= (13.31)/(10)`

`= (1331)/(1000)`

`= ((11)/(10))^3`.

So, `(1 + R/(100))`

`= (11)/(10)` or

`= R/(100)`

`=((11)/(10) - 1)`

`= 1/(10)` or

`R = 10`.

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