What would a customer pay for the stereo of a 6% sales tax was added to the sale price? follow the problem-solving process and round your answer to the nearest cent, necessary the discount on a new stereo was 120. this was a discount of 20%

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?