Hello! How would you write discrete-time matrix model for this?

B. UCLA student population consists of hipsters (H), nerds (N), and regular folks (R). Write down a discrete-time matrix model of UCLA student population, by using the following assumptions. Each year, 20 percent of the hipsters graduate. Each year, 10 percent of the hipsters turn into nerds. Each year, 30 percent of the nerds graduate. . Each year, 15 percent of the nerds turn into hipsters. . Each year, 5 percent of the nerds turn into regular folks. Each year, 25 percent of the regular folks graduate. Each year, 35 percent of the regular folks turn into nerds. Include a flow diagram and show any steps involved