c. Maximize Z=6A+3B (revenue) Subject to Material 20A+6B600 lb Machinery 25A+20B1,000 hour Labor 20A+30B1,200 hour A,B0 1. What are the optimal values of the decision variables and Z ? 2. Do any constraints have (nonzero) slack? If yes, which one(s) and how much slack does each have? The third constraint has a slack of 120. The second constraint has a slack of 60 . The first constraint has a slack of 80 . 3. Do any constraints have (nonzero) surplus? If yes, which one(s) and how much surplus does each have? None of the constraints have any surplus. The second constraint has a surplus of 15 . The first constraint has a surplus of 20