If there is 10% inflation in Brazil, 15% inflation in Argentina, and the Argentine peso weakens by

Question:

If there is 10% inflation in Brazil, 15% inflation in Argentina, and the Argentine peso weakens by 21% relative to the Brazilian real, by how much has the peso strengthened or weakened in real terms? What effect do you expect that this change in the real exchange rate would have on trade between the two countries?

Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...