For the question below, the 180-day interest rate means the annualized interest rate, or the ones that already adjusted/converted from annualized interest rate by dividing 2? And do you have some justification from textbook for this?

7.) Takeshi Kamada-CIA Japan (A). Takeshi Kamada, a foreign exchange trader at Credit Suisse (Tokyo), is exploring covered interest arbitrage possibilities. He wants to invest $5,000,000 or its yen equivalent, in a covered interest arbitrage between U.S. dollars and Jap- anese yen. He faced the following exchange rate and interest rate quotes. Is CIA profit possible? If so, how? Arbitrage funds available Spot rate (/$) $5,000,000 118.60 180-day forward rate (Y/$) 11780 180-day U.S. dollar interest rate 180-day Japanese yen interest rate 4.800% 3.400%