A man sells two articles, each for $Rs.\,640.$ He earns $20 \%$ profit on the first, and $40 \%$ profit on the second. Find his overall percent profit.

  • A

    $29 \frac{1}{2}$

  • B

    $28 \frac{1}{2}$

  • C

    $29 \frac{3}{13}$

  • D

    None of these

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