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Explanation:

To get the median salary, we arrange the salaries of the 9 employees in numerical ascending order. 

The salaries when arranged in ascending numerical order will be as follows 
 
15000, 15000, 15000, 15000, 15000, 40000, 40000, 40000, 66000 

Now the median of these 9 values will be the middle value i.e., 5th value which is 15,000.
  
∴ Median = 15000
 
Mean Salary of these 9 employees = (15000×5 + 40000×3 + 66000)/(5 + 3 + 1) = 29,000
 
∴ Mean salary exceeds Median Salary by 29000 -15000 = 14000.

Hence, option (b).

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