The ratio 9 : 5 expressed as a percent equals	Choose the correct answer.
A) 12.5 % B) 40 % C) 180 % D) 125 % E) none

Rationale: "solution 9 : 5 = 9 / 5 = ( 9 / 5 x 100 ) % . = 180 % . answer c"
Answer: C