The S.I. on a certain sum of money for 2 years at 8% per annum is half the C.I. on Rs. 4000 for 2 years at 10% per annum. The sum placed on S.I. is?  Choose the correct answer:  A) 2197  B) 1267  C) 1750  D) 2267  E) 2625
Explanation:   C.I. = [4000 * (1 + 10/100)2 - 4000]   = (4000 * 11/10 * 11/10 - 4000) = Rs. 840.   Sum = (420 * 100)/(2 * 8) = Rs. 2625   Answer:2625
<result>E</result>
The S.I. on a certain sum of money for 2 years at 8% per annum is half the C.I. on Rs. 4000 for 2 years at 10% per annum. The sum placed on S.I. is?