China Naming Network - Eight-character fortune telling - Questions about probability calculations

Questions about probability calculations

Suppose rain in Beijing is event A and rain in Tianjin is event B

Then P(A)=0.3, P(B)=0.2

P (BlA)=0.8

Then the probability of it raining at the same time P(AB)=P(A)P(BlA)=0.3*0.8=0.24