In a survey of 248 people, 156 are married, 70 are self-employed, and 25 percent of those who are married are self-employed. If a person is to be randomly selected from those surveyed, what is the probability that the person selected will be self-employed but not married?
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A\frac{1}{8}
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B\frac{4}{31}
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C\frac{117}{248}
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D\frac{1}{4}
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E\frac{31}{117}