Q$82.$##$11$

A triangular gate with a base width of $2$m and a height of $1\mathrm{.}5$m lies in a vertical plane. The top vertex of the gate is $1\mathrm{.}5$m below the surface of a tank which contains oil of specific gravity $0\mathrm{.}8.$ Considering the density of water and acceleration due to gravity to be $1000$kg$/$m$^3$ and $9\mathrm{.}81$m$/$s$^2,$respectively$,$ the hydrostatic force in $($kN$)$exerted by the oil on the gate is$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.$