A trader mixes three varieties of groundnuts costing $Rs. \,50, Rs.\, 20$ and $Rs.\, 30$ per $k g$ in the ratio $2: 4: 3$ in terms of weight and sells the mixture at $Rs.\, 33$ per $kg .$ What percentage of profit does he make?

  • A

    $8$

  • B

    $9$

  • C

    $10$

  • D

    None of these

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