If 15% of 30% of 50% of a number is 126, then what is the number?	Options: A) 5000 B) 5600 C) 5400 D) 4500 E) none of these

Rationale: "let the number be a given , 15 / 100 * 30 / 100 * 50 / 100 * a = 126 = > 3 / 20 * 3 / 10 * 1 / 2 * a = 126 = > a = 10 * 20 * 10 * 2 = 5600 . answer : b"
Answer: B