The distribution of 100 workmen employed in a factory according to their monthly salary, showed an average salary of Rs. 4,500 per month. If the median salary is found to be Rs. 4,900, find the mode salary.

Total number of workmen = 100

Average (mean) salary = Rs. 4500

Median salary = Rs. 4900

​$$\text{Mode} = 3 \times \text{Median} - 2 \times \text{Mean}$$​​

Substituting the values of mean and median:

​$$\text{Mode} = 3 \times 4900 - 2 \times 4500$$​​

​$$\text{Mode} = 14700 - 9000 = 5700$$​​

Thus, The mode salary is Rs. 5700.