Following is some information about ACME Inc. three plants: Facility A B and C

Following is some information about ACME Inc. three plants: Facility A B and C.
Facility A: Units produced per month: 60000; workers: 8; salary per worker: $20 machine hours: 500 and cost of materials: $20000.
Facility B: Units produced per month: 55000; workers: 7; salary per worker: $15; machine hours: 800 and cost of materials: $22000.
Facility C: Units produced per month: 50000; workers: 6; salary per worker: $10; machine hours: 700 and cost of materials: $19000. * Machine Cost per hour is $3 for all three plants. Which plant should be closed and which one should be expanded based on their productivities? Please show your work. Thank you!