What will be the ratio of simple interest earned by certain amount at the same rate of interest for 6 years and that for 9 years ? Choose the correct choice from the following answers.
A) 1 : 3	B) 1 : 4	C) 2 : 3	D) Data inadequate	E) None of these
Solution   22.20   Let the principal be P and rate of interest be R%.   ∴ Required ratio =[(pxRx6/100) / (pxRx9/100)]=6PR/9PR   =6/9=2 : 3 .   Answer 2 : 3
<result>C</result>
What will be the ratio of simple interest earned by certain amount at the same rate of interest for 6 years and that for 9 years ?