In 1908, a model t cost $950. by 1927, ford had become so efficient that the car’s price dropped to $280. what was the percentage decrease in price from 1908 to 1927?

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?