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Interest rate

Assume that the 180-day interest rate is 1% and 3%, respectively in the U.S. and Japan. Also, the spot rate and 180-day forward rate are equivalent at 120 yen per one U.S. dollar ($.008333 per one Japanese yen). As a trader for a commercial bank with $1,000,000 to invest, could earn a risk-free return by engaging in covered interest arbitrage? Be sure to show your calculations.

I have no idea what to do???

Solution Preview

If the spot rate and 180-day forward rate are the same at 1USD= 120Yen, but the 180-day interest rates are different, the trader can invest to arbitrage.
First, at the beginning, exchange the $1,000,000 into JPY, ...

$2.19