Foreign Exchange Risk and the Cost of Borrowing Swiss Francs. 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 SF$1\mathrm{.}6$ million, a one$-$year period, an initial spot rate of SF$1\mathrm{.}4900/$$$,$ a $5\mathrm{.}456\%$ cost of debt, and a $36\%$ 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$.$ SF$1\mathrm{.}4900/$$

b$.$ SF$1\mathrm{.}4400/$$

c$.$ SF$1\mathrm{.}3970/$$

d$.$ SF$1\mathrm{.}6030/$$

a$.$ If the exchange rate at the end of the period was SF$1\mathrm{.}4900/$$$,$ what is the effective after$-$tax cost of debt?

$\%($Round to four decimal places.$)$