1) Computation of Price of the same hiking boots in Brazil:

Real Exchange Rate = Nominal Exchange Rate * (Price in Foriegn Country) / (Price in Domestic Country)

6/5 = 2 * 120/Price in Brazil

Price in Brazil = 120 * 2 * 5/6 = 200 brazilian reais

2) Computation of Trade Balance:

Trade Balance = Imports - Exports 

= 300 billion pesos - 500 billion pesos

Trade Balance = -200 billion pesos

So, there is trade deficit of 200 billion pesos.

3)

A) As the funds are used to import $800000 worth of coffee thus net exports (i.e. exports-imports) have reduced. So, U.S. net exports decreased by $800,000. 

B) Net capital outflows increased because of the imports worth $800,000. So, U.S. net capital outflows increased by $800,000.