The chapter demonstrated that a firm borrowing in a foreign currency could potentially end up paying a very different effective rate of interest than what it expected. Using the same baseline values of a debt principal of SF1.4 million, a one-year period, an initial spot rate of SF1.5400/$, a 4.797% cost of debt, and a 38% tax rate, what is the effective after-tax cost of debt for one year for a U.S. dollar-based company if the exchange rate at the end of the period was:

a. SF1.5400/$

b. SF1.4700/$

c. SF1.3940/$

d. SF1.6530/$