The Sweet Smell Fertilizer Company markets bags of manure labeled "not less than 60 lb dry weight." The packaged manure is a combination of compost and sewage wastes. To provide good-quality fertilizer, each bag should contain at least 30 lb of compost but no more than 40 lb of sewage. Each pound of compost costs Sweet Smell 5 cents and each pound of sewage costs 4 cents.

a) Define appropriate decision variables

x:

y:

b) Define the objective function. List the function. Maximize or Minimize?

c) Formulate all needed constraints