Banking of Roads

A car moves at a speed of $36 {\mathrm{kmh}}^{-1}$ on a level road. The coefficient of friction between the car tyres and the road is $0.8$. The car negotiates a curve of radius $R$. If $g=10{ \mathrm{ms}}^{-2}$, the car will skid (or slip) while negotiating the curve, if the value of $R$ is