The average expenditure of a man for the first five months is $Rs.\, 3600$ and for next seven months it is $Rs.\, 3900 .$ If he saves $Rs.\, 8700$ during the $year,$ his average income per $month$ is (in $Rs.$)

  • A

    $4500$

  • B

    $4200$

  • C

    $4050$

  • D

    $3750$

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