Suppose an economy produces steel, wheat, and oil. The steel industry produces $100,000 in revenue, spends $4,000 on oil, $10,000 on wheat, pays workers $80,000. The wheat industry produces $150,000 in revenue, spends $20,000 on oil, $10,000 on steel, and pays workers $90,000. The oil industry produces $200,000 in revenue, spends $40,000 on wheat, $30,000 on steel, and pays workers $100,000. There is no government. There are neither exports nor imports, and none of the industries accumulate or deaccumulate inventories. Calculate GDP using the production and income approaches.