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Question

The mean yearly salary of an employee of a company was Rs. 20,000. If the mean yearly salaries of male and female employees were Rs. 20800 and Rs. 16800 respectively, then the percentages of males and females employed by the company are respectively.

A
80% and 20%
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B
70% and 30%
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C
55% and 45%
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D
50% and 50%
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Solution

The correct option is A 80% and 20%
Let the number of male and female employees be x and y respectively. Then
20800x+16800y=20000(x+y)
or 208x+168y=200(x+y)
or 8x=32y or x=4y
% of male employees =xx+y×100
=4y4y+y×100=80%
% of female employees =yx+y×100
=y4y+y×100=20%

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