Option C, which states that B's salary is less than that of A by 20%, is the correct answer.
Let's assume B's salary as x. According to the given information, A's salary is 25% more than B's salary. This means A's salary is x + 25% of x, which can be written as:
A's salary = x + (25/100) * x = x + 0.25x = 1.25x
To find the difference between B's salary and A's salary, we subtract B's salary from A's salary:
Difference = A's salary - B's salary = (1.25x) - x = 0.25x
Now, to express the difference as a percentage of B's salary, we divide the difference by B's salary and multiply by 100:
Percentage difference = (0.25x / x) * 100 = 25%
Therefore, the correct answer is option C, which states that B's salary is less than that of A by 20%.