What will the ratio of simple interest earned by certain amount at the same rate of interest for7 years and that for 9 years.
Answers.
A) 7:5	B) 2:5	C) 2:9	D) 7:9	E) None of these
Explanation:   Let the principal be P and rate be R   then   ratio = [(P∗R∗7/100) /(P∗R∗9/100)]   =7PR /9PR=7:9   Option 7:9
<result>D</result>
What will the ratio of simple interest earned by certain amount at the same rate of interest for7 years and that for 9 years.