What will be the ratio of simple interest earned by certain amount at the same rate of interest for 3 years and that for 15 years?  Choose the correct choice from the following choices.
A) 3 : 2  B) 1 : 5  C) 2 : 3  D) 3 : 1  E) 2 : 1
Explanation :   Simple Interest = PRT/100   Here Principal(P) and Rate of Interest (R) are constants   Hence, Simple Interest ∝ T   Required Ratio = Simple Interest for 3 years/Simple Interest for 15 years   =T1/T2   =3/15   =1/5   =1:5   Answer : Option 1 : 5
<result>B</result>
What will be the ratio of simple interest earned by certain amount at the same rate of interest for 3 years and that for 15 years?