Jim builds two kinds of bird houses: A standard model and a deluxe model.

• It takes 1 hour to build a standard model and 2 hours to build a deluxe model.

• The materials for each standard model cost $3 and the materials for each deluxe model cost $8.

• Jim has guaranteed that he will build at least 2 standard models and at least 6 deluxe models each month.

• Suppose that Jim can only work at most 50 hours on building the bird houses in a month and he has a total budget of at most $240 monthly for materials.

• He plans to sell his standard bird house for a price of $10 and his deluxe bird house for a price of $35 each.

How many bird houses of each type will he need to make each month to maximize revenue?