What percentage of students passed in exactly one subject ........

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Consider the following for the next 04 (four) items that follow :
In an examination of Class XII, 55% students passed in Biology, 62% passed in Physics, 60% passed in Chemistry, 25% passed in Physics and Biology, 30% passed in Physics and Chemistry, 28% passed in biology and Chemistry. Only 2% failed in all the subjects.

What percentage of students passed in exactly one subject?

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