Question:A sum of money at simple interest amounts to Rs. `2240` in `2` years and to Rs. `2600` in `5` years. What is the principal amount ? 

A `Rs. 1520` 
B `Rs. 1880` 
C `Rs. 2120` 
D None 

+ Answer
D 

+ Explanation
S.I for `3` years 

`= Rs. (2600 - 2240)`

`= Rs. 360`

S.I for `2` years 

`= Rs. (360/3 xx 2)`

`= Rs. 240`

:. principal `= Rs. (2240 - 240)`

`= Rs. 2000`

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