Problem 21-12 Spot versus Forward Rates [LO1] Suppose the spot and three-month forward rates for the yen are $79.30 and X78.72, respectively. What would you estimate is the difference between the annual inflation rates of the United States and Japan? (A negative answer should be indicated by a minus sign. Enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Annual inflation rate differential 3.87%