1.

The simple interest on a certain sum of money for 2 1/2 years at 12% per annum is Rs. 40 less than the simple interest on the same sum for 3 ½ years at 10% per annum. Find the sum.

Answer»

Let the sum be Rs. x Then, ((x*10*7)/(100*2)) – ( (x*12*5)/(100*2)) = 40 

(7x/20)-(3x/10)=40 

x = (40 * 20) = 800. 

Hence, the sum is Rs. 800.



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