₹9000 becomes ₹18000 at simple interest in 1 year. Find the rate percent per annum.

100 %

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10 %

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25 %

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15 %

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Solution

The correct option is A $100 %$
Interest $= ₹ (18000 - 9000) = ₹ 9000$
$9000 = \frac{9000 \times 1 \times r}{100}$
$100 = r$
$r = 100 %$

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