Discussion
How much time will take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple interest?
Answer: B
\[ \text{SI} = \frac{P \times R \times T}{100} \]
\[ 81 = \frac{450 \times 4.5 \times T}{100} = 20.25\,T \]
\[ T = \frac{81}{20.25} = 4 \text{ years} \]
The interest is 18% of the principal, and at 4.5% a year that takes exactly four years.
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