Answer :
Currency exchange rates based on many different factors. These factors are interest rates, inflation, public debt, deficits, terms of trade and political stability or the economic performance. Due to the many factors that affects currency exchange rate, it is almost impossible to predict where it is heading.
Im gonna guess that you are doing the same thing that i did so here is the answer.
1. A) each country's economy
2. D) a,b, or c
3. A)¥186.66 JPY
4. D) $143.04 USD