If it is assumed that 50 percent of those who receive a questionnaire by mail will respond and 300 responses are needed, what is the minimum number of questionnaires that should be mailed? Pick: A) 400 B) 420 C) 480 D) 500 E) 600

Rationale: "minimum no of mail to be sent for getting 300 responses at 50 % = 300 / 0.5 = 600 option e"
Answer: E