A sold a pen to $B$ at a profit of $20\%,$ $B$ sold the same pen to $C$ for $Rs.\,75$ thereby making a profit of $25 \% .$ Find the price at which A bought the pen? (in $Rs.$)

  • A

    $20$

  • B

    $42$

  • C

    $50$

  • D

    $64$

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