A vendor bought toffees at $6$ for a rupee. How many for a rupee must he sell to gain $20 \% ?$

  • A

    $3$

  • B

    $4$

  • C

    $5$

  • D

    $6$

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$I.$ $2 x^{2}-11 x+15=0$

$II$. $2 y^{2}-11 y+14=0$