Suppose that the current exchange rate is $1\mathrm{.}00=$$$1\mathrm{.}20.$ The indirect quote, from the U$.$S$.$ perspective is $q,$

$$0\mathrm{.}6250=$$$1\mathrm{.}00$

$1\mathrm{.}00=$$$1\mathrm{.}20$

$1\mathrm{.}20=$$$1\mathrm{.}00$

$0\mathrm{.}8333=$$$1\mathrm{.}00$