Discussion
If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?
Answer: D
\[ \text{SI} = \frac{P \times R \times T}{100} \]
"Produces rupees nine" means the interest itself is Rs. 9.
\[ 9 = \frac{1 \times R \times 40}{100} = 0.4R \]
\[ R = 22.5 = 22\tfrac{1}{2}\% \]
Here the 9 is the interest, not the amount - if it were the amount the interest would be 8 and the rate 20%, which is why that value is also on the list.
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