Of the drivers who stop at a gas station, 91% purchase gasoline, and 5% purchase both gasoline and oil. A total of 9% purchase oil.

(a) What is the probability that a driver purchases gasoline, given that he or she purchases oil? Round your answer to 2 decimal places.

(b) What is the probability that a driver purchases oil, given that he or she purchases gasoline? Round your answer to 2 decimal places.