Answer:
Weakened
Step-by-step explanation:
When initially in January 2002, the rate of exchange was 1 Argentine Peso for 1 U.S. Dollar.
Later on, it is observed that the rate of exchange is 1.40 Argentine Peso for 1 U.S. Dollar.
It is clear that buying capacity of dollar has increased and that of peso has decreased.
Argentine Peso is depreciated by 40% that earlier 1 Dollar = 1 Peso
Now, decreased value = 1.4 Peso - 1 Peso = 0.4 Peso.
Thus, (change in value)/(Actual Initial Value) = 0.4/1 = 40%
Peso has depreciated or weakened by 40%.