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?

1:3
1:4
2:3
data is inadequate

Correct Answer: 2:3

Explanation:

Let the principal be P and rate of interest be R%.

Required ratio = $\frac{\frac{P * R * 6}{100}}{\frac{P * R * 9}{100}} = \frac{6 P R}{9 P R} = \frac{6}{9} = \frac{2}{3}$

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