If the rate of mark-up on selling price of lettuce in a grocery store is 60% of the selling price, what is the rate of mark-up on cost?

Opinion-polling organizations sometimes contact their respondents by sampling random telephone numbers.Assume that interviewers can now reach about 74% of Canadian households,while the percentage of those contacted who agree to cooperate with the survey is 32%.Each household,of course,is independent of the others.What is the probability of failing to contact a household or of contacting the household but not getting them to agree to the interview?

A) 0.177
B) 0.823
C) 0.497
D) 0.763
E) 0.452