Observe the graph and answer the question given below.
The bar graph represents a company's data about the number of employees hired, promoted and fired.

Assume there was no change in employee numbers other than the Hire and Fire data provided above.
If the Employee strength in the company was 500 employees in 2001, what would be the approximate difference in the employees promoted, as a percentage of employee strength, for the years 2001 and 2004.

Correct option is C

Solution:
Number of employees promoted in 2001 = 25
Number of employees promoted in 2004 = 40
Difference = 40 - 25 = 15
Now
​we calculate the percentage of promoted employees based on the employee strength in 2001 (500 employees).
So,
Required % =$$\frac{15}{500}\times 100$$​​
=> 3%