Correct option is B
Given
20% of a number added to 84 results in the number itself
Solution
Let the unknown number be x.
x = 0.20x + 84
x - 0.20x = 84
0.80x = 84
x =
x = 105
Required Value = 0.75 105
Required Value = 78.75
Final Answer
So the correct answer is (b)