Rocky's Pre$-$Cast Shop is considering two different processes for completing Pre$-$Cast jobs. Process A uses one person to setup the job and do the pre$-$casting. If this approach is used, an experienced person can complete an average of $16$ jobs per day. Process $B$ uses two people. One person does the setup and the second person does the actual pre$-$casting. Setup on one job can be done while pre$-$casting is being completed on an $3$ ther but pre$-$casting must be completed on a job before the pre$-$cast machine can start processing the next. After some practice, this second process can be completed with a standard time of $9$ minutes for setup and $16$ minutes for actual pre$-$casting. In either case, assume an $8-$hour day, $5$ days per week, $250$ days per year. The two employees in process $B$ can start their shifts at different times.

$3.$ If Rocky's is primarily interested in providing low cost to customers, which process should he put in place?