Discussion
Find the simple interest (in ₹) on ₹7,200 at 3% per annum for 6 years.
Answer: D
The simple interest is Rs 1,296. Simple interest is the product of principal, rate and time, divided by 100.
\[ SI = \frac{7200 \times 3 \times 6}{100} \]
\[ = 72 \times 18 = 1296 \]
The other options 1,269, 1,239 and 1,263 use the same digits with a transposition or a small slip in the arithmetic. For example, 72 x 17 = 1,224 and 72 x 18 = 1,296, so none of them is the interest for six years at 3 per cent.
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