Drag each object to show whether the cost is proportional to the area in the situation represented. A wood deck quoted at a bulk cost for 25 square feet Carpeting that costs $22 for every 3 square yards. Mulch costs a set amount to cover a square foot. Asphalt sealant that is quoted at a set price per square foot, plus a labor fee. Categories Cost Is Proportional to Area , Cost Is NOT Proportional to Area, Not Enough Information I will mark you brain list!