need assistance to understand i got this wrong

A certain parking lot has three entrances. 40% ofdrivers use entrance 1 {A1}, 35% use entrance 2 [A2]. and 25% use entrance 3 {A3}. Of those drivers using entrance 1, 30% park for more than two hours {event B]. Of those drivers using entrance 2, 60% park for more than two hours, whereas of those using entrance 3, 50% park for more than two hours. What is the correct probability notation to represent 30%