Problem:
Suppose the nominal interest rate in the US is 7.5% and US inflation is 3.5%. Also the Canadian dollar spot rate is 0.8574 and the Japanese yen spot rate is 0.00688. Finally, the 90-day forward rate for the Canadian dollar is 0.8493 and for the Japanese yen is 0.00700.
Suppose the nominal 90 day US interest rate is 1.875%. Then Canadians nominal 90-day interest rate is approximately: