A breath analyzer, used by the police to check whether drivers exceed the legal limit set for the percentage of drunk al

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A breath analyzer, used by the police to check whether drivers
exceed the legal limit set for the percentage of drunk alcohol is
known to satisfy P (A | B) = P ( | ) = q where A is the event
"the breath analyzer indicates that the legal limit is exceeded"
and B "the driver's blood alcohol level exceeds the legal limit."
On a Saturday night, about 1.5% of drivers exceed the limit.
a) Describe in words the meaning of P ( | A)
b) Determine P ( | A) if q = 0.95
c) What should be q so that P (B | A) =0.99?