Table: Demand and Supply for Iron Ore

Price/ton	Quantity demanded (tons)	Quantity supplied (tons)
$100	10	100
$90	20	90
$80	30	80
$70	40	70
$60	50	60
$50	60	50
$40	70	40
$30	80	30
$20	90	20
$10	100	10

This table represents a demand and supply schedule for a small-country producer of iron ore that sells output in its home market and on the world market at the world price of $70 per ton. What is the total value of the export subsidy that exporters receive?

Group of answer choices

$500

$800

$400

$100