What will be the ratio of simple interest earned by certain amount at the same rate of interest for 14 years and that for 18 years?  Choose the most appropriate option:
A) 7 : 9 B) 8 : 9 C) 5 : 9 D) Data inadequate E) None of these
Let the principal be P and rate of interest be R%.   ∴ Required Ratio = [(P×R×14/100) /(P×R×18/100)]=14PR/18PR=14/18=7:9   7 : 9nswer 7 : 9
<result>A</result>
What will be the ratio of simple interest earned by certain amount at the same rate of interest for 14 years and that for 18 years?