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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

What is $\frac{1}{2}$ of $10\%$ of $20$ ?

(A) $1$ (B) $2$ (C) $5$ (D) $10$ (E) $20$

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Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.