The average salary of male employees in a firm was Rs 5200 and that of females was Rs 4200 The mean ...........

Quantitative Aptitude (CGL) Average

The average salary of male employees in a firm was Rs. 5200 and that of females was Rs. 4200. The mean salary of all the employees was Rs. 5000. What is the % of female employees?

80%

20%

40%

30%

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Explanation:

Suppose the number of male employees = x; and the number of female employees = y;
5200*x + 4200*y = 5000*(x + y);
200x = 800y; =>x = 4y;
Hence, % of female employees = y*100/(x+y) = 100/5 = 20%.