c$.$ What is the $6-$month Swiss bill rate? $($Round exchange rate to four decimal places and interest rate to three decimal places.$)$

$\backslash$table$[[$Six$-$month Swiss bill rate,$],[$Spot rate, midrate $($SF$/$$$),1\mathrm{.}2578],[$Six$-$month forward rate, midrate $($SF$/$$$),1\mathrm{.}2603],[$Maturity $($days$),180],[$Six$-$month U$.$S$.$ dollar treasury rate $($yield$),4\mathrm{.}100\%$