Discussion
Find the simple interest on Rs. 5,200 for 2 years @ 6 per cent per annum.
Answer: D
The simple interest is Rs. 624.
Simple interest is principal times rate times time, divided by 100:
\[ \begin{aligned} SI &= \frac{P \times R \times T}{100} \\ &= \frac{5200 \times 6 \times 2}{100} \\ &= 624 \end{aligned} \]
Check: one year's interest at 6% on Rs. 5,200 is Rs. 312, and two years give twice that. Rs. 600 is what you get by rounding the principal to Rs. 5,000, and Rs. 524 or Rs. 450 come from arithmetic slips.
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