Correct Answer - Option 2 : 80 : 20
Given:
In a firm the average salary of male employees = Rs. 520
in a firm the average salary of female employees = Rs. 420
the overall average salary = Rs. 500,
Formula used:
Average = (n1 × X1 + n2 × X2)/(n1 + n2)
Calculation:
500 = (M × 520 + F × 420)/(M + F)
⇒ 500M + 500F = 520M + 420F
⇒ 80F = 20M
⇒ M : F = 80 : 20
∴ The required ratio of Male and Female is 80 : 20.