If 50% of 100 is greater than 20% of a number by 47, what is the number? Choose the correct choice from the following options
A) 60	B) 30	C) 15	D) 75	E) 100

Rationale: "explanation : 50 / 100 * 100 - 20 / 100 * x = 47 50 - 20 / 100 * x = 47 3 = 20 / 100 * x 3 * 100 / 20 = x 15 = x answer : option c"
Answer: C