SOLUTION: (A)=25,P(B|A)=9/20,P(A∩B)=?

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Question 1122341: (A)=25,P(B|A)=9/20,P(A∩B)=?
Answer by math_helper(2461) About Me  (Show Source):
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(A)=25,P(B|A)=9/20,P(A∩B)=?
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I will assume "(A)=25" is supposed to be "P(A) = 2/5" as nothing else makes sense.

Regarding conditional probabilities, there is this relation:
P(A∩B) = P(B|A)*P(A) = P(A|B)*P(B)

P(A∩B) = P(B|A)*P(A) = (9/20)(2/5) = 18/100 = +highlight%28+0.18+%29+