A production process operates with 0.5% nonconforming output. Every hour a sample of 50 units of product is taken, and the number of nonconforming units counted. If one or more nonconforming units are found, the process is stopped and the quality control technician must search for the cause of nonconforming production. Evaluate the performance of this decision rule. That is, what percentage of the samples will make the process to be stopped to look for a cause.