Parts X and Y are metal parts and produced separately, each requiring two press-working operations. Part X is routed through operations 1 and 2, and part Y is routed through operations 3 and 4. The two parts are then joined in a welding step (operation 5), and the assembly is routed to an electroplating operation (operation 6). The six operations have the following fraction defect rates: q1 = 5%, q2 = 15%, q3 = 10%, q4 = 20%, q5 = 13%, q6 = 8%. If the desired final quantity of assemblies is 100,000 units, how many starting units of parts X and Y will be required? There is no inspection or separation of defective units until after the final process, so defective units and good units are processed together through all production processes