The average age of $8$ members of a group is $40 \,years.$ The age of $1$ member is $55\, years.$ After his retirement a new member comes in his place of age $39 .$ What is the effect of his retirement on the average age of group ?

  • A

    $2$

  • B

    $0$

  • C

    $3$

  • D

    $5$

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