Simple interest on a certain sum of money for 2 years at 12% per annum is half the compound interest on Rs. 6000 for 2 years at 15% per annum. The sum placed on simple interest is	Options:  A) Rs.6000  B) Rs.7935  C) Rs.8265.63  D) Rs.3967.5  E) None
Solution   C.I.	=Rs[6000x(1+15/100)Â²-4000]   Rs.(4000x115/100x115/100-6000)	= Rs.7935.   Sum	=Rs. [3967.5x100 /4x12]   = Rs.8265.63.   Answer Rs.8265.63
<result>C</result>
Simple interest on a certain sum of money for 2 years at 12% per annum is half the compound interest on Rs. 6000 for 2 years at 15% per annum. The sum placed on simple interest is