Question:A sum of Rs. 2400 amounts to Rs.3264 in four years at a certain rate of simple interest.If the rate of interest is increased by 1% the same sum n the same time would amounts to : 

A Rs. 3288 
B Rs. 3312 
C Rs. 3340 
D Rs. 3360 

+ Answer
D 

+ Explanation
Original rate` = ((864 xx 100)/(2400 xx 4))`

                 `= 9%`

New rate` = 10%`

Now S.I` = (2400 xx 10 xx 4/100) =  960`

:. Amount` = Rs. (2400 + 960)`

             `= Rs. 3360.`

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