if the exchange rate is 2 brazilian reals per dollar and a meal in rio costs 20 reals, then how many dollars does it take to buy a meal in rio? a. $40 and your purchase will decrease brazil's net exports. b. $40 and your purchase will increase brazil's net exports. c. $10 and your purchase will decrease brazil's net exports. d. $10 and your purchase will increase brazil's net exports.