A factory utilizes two different production lines (A and B) for manufacturing gizmos. Since production line A is faster, it is able to
produce 60% of the gizmos, with the remaining gizmos coming off of production line B. It is known that 2% of the gizmos from
production line A and 4% of the gizmos from production line B will contain some small defect.
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Based upon this, if a gizmo is randomly selected from among all gizmos produced at this factory and the gizmo is found to have a
defect, what is the probability the gizmo came off production line B?