An automobile plant contracted to buy shock absorbers from two suppliers X and Y. x supplies 60% and Y supplies 40% of the shock absorbers. All shock absorbers are subjected to a quality test. the ones that pass the quality test are considered reliable. Of X' shock absorbers, 96% are reliable, of Y's shock absorbers, 72% are reliable. The probability that a randomly chosen shock absorber, which is found to be reliable, is made by Y is