13 . A political candidate wants to make a mass mailing of some literature to counteract some nasty cmarks his opponent has recently made . Five mailing lists have been identified that contain names and addresses of voters our candidate might like to reach Each list may be purchased for a price . A partial list cannot be purchased The numbers of names each list contains in each of four professions are listed below Names on Each List in food's by Profession Mailing Business Craft Cost of List Law Health Executives Professionals List 4 DOU 29 52090 74 GOOD CL 32 090 43 090 Desired 27 70 Coverage but candidate has estimated how many voters he wants to reach in each profession This is listed in the row " Desired Coverage " Having a more limited budget than the opponent , our candidate does not want to spend any more than he has to in order to " do the job " a ) How many decision variables would you need to model this problem ? b ) How many constraints would you need to model this problem ? ) Define the decision variables you would use and write the objective fiction I Write a complete model formulation