Discussion

A sum of money lent out at S.I. amounts to Rs. 720 after 2 years and to Rs. 1020 after a further period of 5 years. The sum is?

Answer: B

\[ \text{SI} = \frac{P \times R \times T}{100} \]

The five years between the two figures account for the whole increase.

\[ \frac{1020 - 720}{5} = \frac{300}{5} = \text{Rs. } 60 \text{ per year} \]

\[ P = 720 - 2 \times 60 = \text{Rs. } 600 \]

"A further period of 5 years" means seven years in all, not five - but only the gap of five is needed.

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