160 is what percent of 50 ?  Choose one.
A) 5 %  B) 20 %  C) 320 %  D) 200 %  E) 500 %

Rationale: "50 * x = 160 - - > x = 3.2 - - > 3.2 expressed as percent is 320 % . answer : c ."
Answer: C