An automobile insurance company classifies drivers as Class A(good risks), class B(medium risks), and class C(poor risks). They believe that class A risks constitute 30% of the drivers who apply to them for insurance, class B 50%, and class C(20%). The probability that a class A driver will have one or more accidents in any 12 month period is .01, for class B is .03, and for class C is .10. The company sells Mr. Jones an insurance policy and within a year he has an accident. What is the probability that Mr. Jones is a class B risk?