Discussion
If A lends Rs.3500 to B at 10% per annum and B lends the same sum to C at 11.5% per annum then the gain of B in a period of 3 years is?
Answer: C
\[ \text{SI} = \frac{P \times R \times T}{100} \]
B pays 10% and receives 11.5% on the same Rs. 3500, so only the 1.5% gap matters.
\[ \text{gain} = \frac{3500 \times 1.5 \times 3}{100} = \text{Rs. } 157.50 \]
Working out the two interests separately gives Rs. 1207.50 received against Rs. 1050 paid - the same Rs. 157.50, for more effort.
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