A shopkeeper purchased $70$ $kg$ of potatoes for $Rs.\, 420$ and sold the whole lot at the rate of $Rs.\, 6.5$ per $kg.$ What will be his gain percent?

  • A

    $4 \frac{1}{6}$

  • B

    $6 \frac{1}{4}$

  • C

    $8 \frac{1}{3}$

  • D

    $20$

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