An oil company is bidding for the rights to drill a well in field A and a well in field B. The probability it will drill a well in field A is 40%. If it does, the probability the well will be successful is 45%. The probability it will drill a well in field B is 30%. If it does, the probability the well will be successful is 55%. Calculate each of the following probabilities: a) probability of a successful well in field A, b) probability of a successful well in field B. c) probability of both a successful well in field A and a successful well in field B. d) probability of at least one successful well in the two fields together,