Answer: 
 of the total employees is women.
 of the total employees is women.
Explanation:
Given : total number of employees remains constant. 
Men hired = 250 per year
Women hired = 200 per year
Women stay 50% longer, 
The number of women is: 

The number of men is: 250
Thus total employees = 300 + 250 = 550
Proportion of women = 

Thus 
 of the total employees is women.
 of the total employees is women.