If 75% of a number is added to 75, then the result is the number itself. The number is :

Answer: Option C

Let the number be x
Then,
75% of x + 75 = x
⇔ x - $$\frac{75}{100}$$ x = 75
⇔ x - $$\frac{3}{4}$$ x = 75
⇔ $$\frac{x}{4}$$ = 75
⇔ x = 300