7) The country of Pepperland exports steel to the Land of Submarines. Information for the quantity demanded (Qd) and quantity supplied (Qs) in each country, in a world without trade, are given in Table 20.6 and 20.7

Table 20.6: Pepperland
Price	Quantity Demanded	Quantity Supplied
$60	230	180
70	200	200
80	170	220
90	150	240
100	140	250

Table 20.7: Land of Submarines
Price	Quantity Demanded	Quantity Supplied
$60	430	310
70	420	330
80	410	360
90	400	400
100	390	440

a) What would be the equilibrium price and quantity in each country in a world without trade? How can you tell?

b) What would be the equilibrium price and quantity in each country if trade is allowed to occur? How can you tell?

c) What would be the amount of exports and imports in each country?

8) In the following graph, Pa is the price if the country has no international trade and Pw is the price on international markets.