Jules is in the business of constructing dog houses. A small dog house requires 6 square feet (ft²) of plywood and 4 ft²of insulation.A large dog house requires 10 ft²of plywood and 12 ft²of insulation. Jules has available only 198 ft²of plywood and 180 ft²of insulation.If a small dog house sell for $15 and a large dog house sells for $20, then how many dog houses of each type should be built to maximize the revenue and to satisfy the constraints?