$\sqrt{0.0009} \times 100$ equals

$\sqrt{0.0009} \times 100$ equals
  1. $3$
  2. $0.3$
  3. $30$
  4. $0.03$

Solution

$\sqrt{0.0009} = 0.03$. Then $0.03 \times 100 = 3$.

Asked in: IMO

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