Water and electricity: fixed comprehensive unit price contract, based on actual area * comprehensive unit price: unit price composition: 20 yuan/m2 for brick wall (120, 200, 240 walls), 40 yuan/m2 for concrete floor, 20 yuan/m for structural column, 70 yuan/m for concrete beam, 10 yuan/piece for upper opening of air conditioning cantilever (about 300mm long), 20 yuan for lower opening of air conditioning cantilever