A company gives a test to 100 salesmen, 80 with good sales records and 20 with poor

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A company gives a test to 100 salesmen, 80 with good sales records and 20 with poor records. 60% of the good salesmen pass the test, but only 30% of the poor salesmen do. A new applicant takes the test and passes. What is the probability that he is a good salesman?

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