Forces and equilibrium — practice question

Particle $Q$ has mass $0.2\,\text{kg}$ and is kept in equilibrium by two light inextensible strings $PQ$ and $QR$. $P$ is a fixed point on a vertical wall, while $R$ is a fixed point on a horizontal floor. The angles that strings $PQ$ and $QR$ make with the horizontal are $60^\circ$ and $30^\circ$ respectively (see diagram).