50
60
70
80
Answer is Wrong!
Answer is Right!
The correct answer is (b) 60.
Let $x$ be the number. Then,
$$\frac{10}{100}x + \frac{25}{100}x + \frac{50}{100}x + \frac{75}{100}x = 24$$
$$\frac{150}{100}x = 24$$
$$x = \boxed{60}$$
Each option can be verified by substituting it into the equation.