A merchant purchases a wrist watch for $Rs.\,450$ and fixes its list price in such a way that after allowing a discount of $10 \%,$ he earns a profit of $20 \%$. Then the list price (in rupees) of the wrist watch is

  • A

    $500$

  • B

    $600$

  • C

    $750$

  • D

    $800$

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