If one Swiss franc can purchase $$0\mathrm{.}8$ U$.$S$.$ dollars, how many Swiss francs can one U$.$S$.$ dollar buy?

Question $8$ options:

$1\mathrm{.}25$

$1\mathrm{.}1765$

$1\mathrm{.}3294$

$1\mathrm{.}0471$