Probability

A dealer gets refrigerators from 3 different manufacturing companies C1,C2 and C3. 25% of his stock is from C1,35% from C2 and 40% from C3. The percentages of receiving defective refrigerators from C1,C2 and C3 are 3%,2%,1% respectively. If a refrigerator sold at random is found to be defective by a customer, then the probability that it is from C2 is