in the public relations section of a large department store, the probability of a consumer complaint referring to defective merchandise is 0.65, the probability of referring to late delivery is 0.30 and the probability of referring to a billing error is of 0.05. the probability of each type of complaint being resolved satisfactorily is 0.70. 0.10;0.90, respectively. if a complaint was resolved satisfactorily, the probability of referring to a billing error is equal to: