Answer:
The reward in this strategy will depend on the international price at which the Yen is placed in the purchase and sale periods.
Example:
If in July it enters into a contract to buy the 10 million Japanese Yen on January 1, 2018. At a price of 100 Yen per dollar.
Then in September the Yen does not cost 100 per dollar but it costs 108 Yen per dollar. Then I sell what I received in the first contract at a more expensive price and I will get a profit by exchange rate.