Assume the current U.S. dollar-yen spot rate is 90 /$. Further, the current nominal 180-day rate of return in Japan is 1% and 2% in the United States. What is the approximate forward exchange rate for 180 days A) 89.12/$ B) 89.55/$ C) 90.89/$ D) 90.45/$ please show the answer brifely.