According to the study of 200 samples of ground meats, the probability that one of samples was contaminated by salmonella was .30. The probability that a salmonella-contaminated sample was contaminated by strain resistant to at least one antibiotic was.70, and the probability that a salmonella-contaminated sample was contaminated by a strain resistant to at least three antibiotics was .52. Find the probability that a ground meat sample that was contaminated by an antibiotic-resistant strain was contaminated by a strain resistant to at least three antibiotics.