Discussion

Rs.800 amounts to Rs.920 in 3 years at simple interest. If the interest is increased by 3%, it would amount to how much?

Answer: D

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

\[ \text{SI} = 920 - 800 = 120 \quad\Longrightarrow\quad 120 = \frac{800 \times R \times 3}{100} = 24R \]

\[ R = 5\% \]

At \( 5 + 3 = 8\% \):

\[ \text{SI} = \frac{800 \times 8 \times 3}{100} = 192 \quad\Longrightarrow\quad \text{amount} = \text{Rs. } 992 \]

The extra 3% over three years adds \( 800 \times 0.09 = 72 \) - the same answer in one step.

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