Question:The simple interest on a certain sum of money at the rate of `5%` for `8` years is Rs.`840`.At what rate of interest the same amount of interest can be received on the same sum after `5` years ? 

A `6%` 
B `8%` 
C `9%` 
D `10%` 

+ Answer
B 

+ Explanation
sun`= Rs. ((100 xx 840)/(5 xx 8))`

`= Rs. 2100`.

 Rate required

`= ((100 xx 840)/(2100 xx 5))%`

`= 8%`

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Irin Moni

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