A trader marked his goods at $20 \%$ above the cost price. He sold half the stock at the marked price, one quarter at a discount of $20 \%$ on the marked price and the rest at a discount of $40 \%$ on the marked price. His total gain is in $\%$?

  • A

    $2$

  • B

    $4.5$

  • C

    $13.5$

  • D

    $15$

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