19. An office supply company sells 3 different computer systems, A, B, and C. 65% of the customers who buy a computer buy brand A, 15% buy brand B, and 20% buy brand C. At the time of purchase, the customer is offered an extended warranty for an added fee. 25% of the customers who bought brand A, 40% of the customers who bought brand B, and 20% of the customers who bought brand C bought the extended warranty. If a customer brings a computer system in for repair under the extended warranty, what is the probability that the computer was a brand A computer? A brand B computer? A brand C computer