Determine the minimum angle at which a roadbed should be banked so that a car traveling at $20\mathrm{.}0$ m$/$s can safely negotiate

the curve if the radius of the curve is $0\mathrm{.}20$ km$.$

$11\mathrm{.}5$

$19\mathrm{.}6$

$78\mathrm{.}2$

$0\mathrm{.}200$

$0\mathrm{.}581$