Question:A certain sum of money lent out at S.I. amounts to Rs.`690` in `3` years and  Rs.`750` in years .The sum lent is : 

A `Rs. 400` 
B `Rs. 450` 
C `Rs. 500` 
D `Rs. 600` 

+ Answer
D 

+ Explanation
S.I for `2` years

`= (750 - 690)`

`= Rs. 60`

S.I for `3` years 

`= Rs. (60/2 xx 3)`

`= Rs. 90`

 :. principal 

`= Rs. (690 - 90)`

`= Rs. 600`

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Irin Moni

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