Actually, as pointed out, the “country currency” is very important. If the country’s inflation rate is 10000% like Brazil back in the late 80’s or many other places since, take the hundred now and spend it immediately. When the debt is due it will be pennies regardless of the answer to the question. :)
For an instantaneous transaction, it doesn’t make any difference. 105 is always bigger than 103. That was the very simple problem posed — without any time consideration.
In the real world of currency contracts or simply deciding how many of your dollars to convert to a foreign currency every day while traveling, you are correct.
My very first foreign assignment in the mid-70s was in Brazil. The exchange rate was posted in the Rio hotel lobby on a chalkboard every morning. During their hyperinflation, I learned to convert as few dollars as possible. An excellent introduction to exchange risk at a young age.