If it is assumed that 60 percent of those who receive a questionnaire by mail will respond and 750 responses are needed, what is the minimum number of questionnaires that should be mailed?	Choose the correct choice from the following options.
A) 1160	B) 1190	C) 1220	D) 1250	E) 1280

Rationale: "let x be the minimum number of questionnaires to be mailed . 0.6 x = 750 x = 1250 the answer is d ."
Answer: D