Simple interest on a certain sum of money for 5 years at 8% per annum is half the compound interest on Rs. 8000 for 2 years at 15% per annum. The sum placed on simple interest is  Choose one.
A) Rs.3225  B) Rs.2580  C) Rs.8000  D) Rs.1290  E) None
Solution   C.I.	=Rs[8000x(1+15/100)Â²-8000]   Rs.(8000x115/100x115/100-8000)	= Rs.2580.   Sum	=Rs. [1290x100 /5x8]   = Rs.3225.   Rs.3225nswer Rs.3225
<result>A</result>
Simple interest on a certain sum of money for 5 years at 8% per annum is half the compound interest on Rs. 8000 for 2 years at 15% per annum. The sum placed on simple interest is