If 25% of a number is added to 78, then the result is the same number. 80% of the same number is:

Correct option is B

Given:

25% of a number is added to 78, and the result is the same number.

Solution:
Let the number be x. The equation formed is:

$$78 + \frac{25}{100} \times x = x \\ \ \\78 + \frac{x}{4} = x\\ \ \\78 = x - \frac{x}{4}\\ \ \\78 = \frac{3x}{4}\\ \ \\x = \frac{78 \times 4}{3} = 104$$​

80% of x = $$\frac{80}{100} \times 104 = 0.8 \times 104 = 83.2$$​​

80% of the number is 83.2.