During every 6-hour period of day, SJ Police Department requires at least the given number of policemen: 12am-6am=12, 6am-12pm=12, 12pm-6pm=4, and 6pm-12am=23. Every policeman has to work 2 consecutive 12 hours.
If you know wages of every policeman per hour, find decision variables, and how many decision variables and restrictions are in problem?