The Sweet Fertilizer Company markets bags of manure laebled "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 ibs of compost, but no more than 40 pounds of sewage. Each pound of compost costs the company 5 cents each and each pound of sewage costs them 4 cents.
Use a graphical LP method to determine the least-cost blend of compost and sewage in each bag.