A manufacturing operation employs two production lines to assemble electronic fuses. Both lines generates fuses at the same rate and generally produce 2.5% defective fuses. But, production line 1 recently suffered mechanical difficulty and produced 6.0% defectives throughout a three week period. This situation was not known till several lots of electric fuses produced in this period were shipped to customers. If one of the two fuses tested by the customer was found to be defective, find out the probability that the lot from which it came was produced on malfunctioning line 1? (Suppose all fuses in a lot were produced at the same line.)