The average salary of male employees in a firm was Rs.520 and that of females was Rs.420. The mean salary of all the employees was Rs.500. The percentage of male employees is

The average salary of male employees in a firm was Rs.520 and that of females was Rs.420. The mean salary of all the employees was Rs.500. The percentage of male employees is

  1. A

    80%

  2. B

    60%

  3. C

    40%

  4. D

    20%

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    Solution:

    Since,x¯1=520,x¯2=420 and x¯=500

    Also we know x¯=n1x¯1+n2x¯2n1+n2

            500n1+n2=520n1+420n2        20n1=80n2        n1:n2=4:1

    Hence, the percentage of male employees in the firm

    =44+1×100=80%

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