In a factory every 5 products out of 100 are faulty. Samples from a randomly selected product are sent to two different labs for testing. Labs have an accuracy of %75, and %90 respectively. If both of the labs report the product is faulty, what is the probability that it really is?

Note: The probability of a lab reporting a faulty product as faulty and a faultless product as faultless are both equal to the accuracy of the lab.

Enter your answer as a simplified fraction. Example:12/23