Discussion
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?
Answer: C
\[ \text{SI} = \frac{P \times R \times T}{100} \]
With the sum and the rate the same, simple interest is proportional to time.
\[ \frac{\text{SI}_{6}}{\text{SI}_{9}} = \frac{6}{9} = \frac{2}{3} \]
So the ratio is \( 2 : 3 \). Neither the sum nor the rate is needed - both cancel - so "data inadequate" is a trap.
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