If it is assumed that 60 percent of those who receive a questionnaire by mail will respond and 240 responses are needed, what is the minimum number of questionnaires that should be mailed? Choose the correct choice from the following answers.
A) 400	B) 500	C) 600	D) 700	E) 800
Let x be the minimum number of questionnaires to be mailed.   0.6x = 240   x = 400   The answer is 400.
<result>A</result>
If it is assumed that 60 percent of those who receive a questionnaire by mail will respond and 240 responses are needed, what is the minimum number of questionnaires that should be mailed?