Donna DePaul is raising money for the homeless. She discovers that every church group requires two hours of letter writing and one hour follow up while every labor union. She needs two hours of letter writing in three hours to follow up. Donna can raise $125 from each church group and $200 from each union local and she has a maximum of 20 hours of letter writing in a box mama 14 hours a follow up available per month determine the most profitable mixture of groups she should contact in the most money she can raise in a month.