The following diagram shows the domestic demand and domestic supply in a market. In addition, assume that the world price in this market is $40 per unit. T Price 190 180 Domestic 170 Supply 160 150 140 - 130- 120 110 100 90 80 70 60 - 50 - 40 30 20 Domestic 10 Demand 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 Quantity Suppose the government imposes a tariff of $20 per unit. The amount of revenue collected by the government from the tariff is O $15,000. $6,000. $9,000. O $12,000