The Wayne Manufacturing Company purchases a certain standard part from three different suppliers: A, B, and C. Supplier A supplies 60% of the demand for these parts, B supplies 30%, and C supplies 10%. The quality of parts varies among the suppliers, with suppliers A, B, and C having reject rates of 0.25%, 1%, and 2%, respectively.
What is the probability that a randomly selected part is defective?
If a defective part is found, which supplier is the most likely source?