Question:A sum was put at simple interest at a certain rate for `2` years. Had it been put at `3%`higher rate, it would have fetched Rs. `72` more.The sum is : 

A `Rs. 1200` 
B `Rs. 1500` 
C `Rs. 1600` 
D `Rs. 1800` 

+ Answer
A 

+ Explanation
Let the sum be x Rs. x and original rate be R%.Then,

`(x xx(R + 3) xx 2)/100 - (x xx R xx 2)/100`

`= 72`

`or 2Rx + 6x - 2Rx`

`= 7200`

`or x = 1200`

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