Output from a process contains $0\mathrm{.}01$ defective unit. Defective units that go undetected into final assemblies cost $$28$ each to replace. An inspection process, which would detect and remove all defectives, can be established to test these units. However, the inspector, who can test $20$ units per hour, is paid $$9$ per hour, including fringe benefits. Should an inspection station be established to test all units?