What will be the ratio of simple interest earned by certain amount at the same rate of interest for 4 years and that for 9 years?
Options:	A) 1 : 3	B) 2 : 3	C) 1 : 2	D) 4 : 9	E) 1 : 4
Let the principal be P and rate of interest be R%.   Required ratio =   (P x R x 4)/100 DIVIDED BY	(P x R x 9)/100   =	4PR/9PR	=	4/9	= 4 : 9.   ANSWER : 4 : 9
<result>D</result>
What will be the ratio of simple interest earned by certain amount at the same rate of interest for 4 years and that for 9 years?