In the survey of 2000 adults 50 years and older of whom 40% were retired and 60% were pre-retired, given question was asked: Do you expect the income requires to differ from year to year in retirement? Of those who were retired, 27% replied no, and 73% answered yes. Of those who were pre-retired, 22% replied no, and 78% replied yes. If the respondent in survey was chosen at random and had replied yes to question, find probability that he or she was retired?