Need explanation and answers along with minitab instructions

Researchers who collect data by use of a questionnaire often must send huge numbers of questionnaire out because of a low rate of return. To estimate the proportion of people who in fact fill out a quistionnaire and return it, several different one page surveys are sent to 300 people. A total of 60 of the surveys are returned. Use this sample to estimate the % of all quistionnaire that are ever completed and returned with a 95% confidence interval.