$A$ solution is obtained by mixing $300 \, g$ of $25 \%$ solution and $400 \, g$ of $40 \%$ solution by mass. Calculate the mass percentage of the resulting solution. (in $\%$)

  • A
    $33.57$
  • B
    $35.57$
  • C
    $30.57$
  • D
    $38.57$

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