Determine the most profitable mixture of groups

Jayanta is raising money for the homeless and discovers each church group requires 2 hours of letter writing and 1 hour of follow-up calls, while each labor union needs 2 hours of letter writing and 3 hours of follow up. She can raise $150 from each church group and $175 from each union. She has a maximum of 16 hours of letter writing and 16 hours of follow-up available each month. Determine the most profitable mixture of groups she should contact and the most money she can raise in a month.