A four-station production line, which produces decorative floor items, has the following data for each station: Workstation 1 has 12 parallel machines and processing times of 30 minutes Workstation 2 has 1 machine with average processing times of 3 minutes per job Workstation 3 has 5 parallel machines with average processing times of 12 minutes per job Workstation 4 has 2 parallel machines with average processing times of 6 minutes per job Calculate the number of work in process units expected at each station. How can we benefit from this information in managing the production line?