The ratio 10:20 expressed as percent equals to	Choices.
A) 50 %	B) 80 %	C) 40 %	D) 90 %	E) 100 %

Rationale: "explanation : actually it means 10 is what percent of 20 , which can be calculated as , ( 10 / 20 ) * 100 = 10 * 5 = 50 answer : option a"
Answer: A