SI on a certain sum of money for 3 yrs at 8 percent /annum is 1/2 the CI on Rs.4000 for 2 yrs at 10 percent/ annum. The sum placed on SI is?	Select:
A) Rs. 1700  B) Rs. 1720  C) Rs. 1750  D) Rs. 1850  E) Rs. 2000
C.I.   = Rs. 4000 x 1 + 10 2 - 4000   100   = Rs. 4000 x 11 x 11 - 4000   10 10   = Rs. 840.   Sum = Rs. 420 x 100 = Rs. 1750.   3 x 8   Rs. 1750
<result>C</result>
SI on a certain sum of money for 3 yrs at 8 percent /annum is 1/2 the CI on Rs.4000 for 2 yrs at 10 percent/ annum. The sum placed on SI is?