Respuesta :

Given P(A)=0.43, P(B|A)=0.89

Definition of conditional probability:
P(B|A)=P(B ∩ A)/P(A) = P(A ∩ B)/P(A) 
=>
0.89=P(A ∩ B)/0.43
=>
P(A ∩ B)=0.89*0.43=0.3827