The simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on $4000 for 2 years at 10% per annum. The sum placed on simple interest is ?	Options:	A) $1250	B) $1300	C) $1750	D) $2015	E) $1452
C.I. = 4000* (1 + 10/100)^2 - 4000 = 4000* 11/10 * 11/10 -4000= 
<gadget id="calculator">4000* 11/10 * 11/10 -4000</gadget>
<output>840</output>
$840   Sum= 420*100/3*8 = $1750   Answer is $1750
<result>C</result>
The simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on $4000 for 2 years at 10% per annum. The sum placed on simple interest is ?