The exchange rates provided in the problem are nominal exchange rates (i.e. rates used for converting one currency into another).
a. Real appreciation = domestic inflation > currency depreciation
For Japan, domestic inflation = 0%
Currency depreciation = -5.2%
For Mexico, domestic inflation = 5%
Currency depreciation = 4.76%
So the order is Japan followed by Mexico
b. Japanese Yen
Let us assume a product which costs 100$ last year.
Price this year = 100*(1+5%) = 105$
Converting 100$ to Yen (last year) = 100*100 = 10,000 Yen
Price this year = 10,000*(1+0%) = 10,000 Yen
To ensure PPP, the price of good in one country should be equal to the price in another
--> 105$ = 10,000 Yen
E(Y/$) = 95.24
Mexican Peso
Let us assume a product which costs 100$ last year.
Price this year = 100*(1+5%) = 105$
Converting 100$ to Peso (last year) = 100*10 = 1,000 Peso
Price this year = 1,000*(1+5%) = 1,050 Peso
To ensure PPP, the price of good in one country should be equal to the price in another
--> 105$ = 1,050 Peso
E(P/$) = 10
c. interest rate differential\
Forward rate = spot rate*(1+iJapan)/(1+iUS)
Forward rate / Spot rate -1 ~= iJapan - iUS
Interest rate differential for Japan = 95/100 - 1 = -5%
Interest rate differential for Mexico = 10.5/10 - 1 = +5%
d. Continuing from part b,
To ensure PPP, nominal exchange rate of Yen E(Y/$) in the current year should have been = 95.24
But the actual nominal exchange rate = 95
To achieve PPP in the long run, Yen will depreciate to reach the rate of 95.24
To ensure PPP, nominal exchange rate of Peso E(P/$) in the current year should have been = 10
But the actual nominal exchange rate = 10.5
To achieve PPP in the long run, Peso will appreciate to reach the rate of 10.
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