A student finds the average of ten $2 -$digit numbers. While copying numbers, by mistake, he writes one number with its digits interchaged. As a result his answer is $1.8$ less than the correct answer. The diference of the digits of the number, in which he made mistake, is

  • A

    $2$

  • B

    $3$

  • C

    $4$

  • D

    $6$

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