From Mechanics

\displaystyle mg=20\times 9\textrm{.}8=196\ \text{N}

Resolving up the plane

\displaystyle \begin{align} & F-mg\sin {{30}^{\circ }}=0 \\ & F=196\times 0\textrm{.}5=98\ \text{N} \\ \end{align}

Resolving in the normal direction

\displaystyle \begin{align} & R-mg\cos {{30}^{\circ }}=0 \\ & R=196\times 0\textrm{.}866=170\ \text{N} \\ \end{align}