Forces and equilibrium — practice question

A block with mass $12\,\text{kg}$ rests on a plane inclined at $24^{\circ}$ to the horizontal. It is connected to a light string that lies at an angle of $36^{\circ}$ above the line of greatest slope. The string tension is $65\,\text{N}$ (see diagram). The coefficient of friction between the block and the plane is $\mu$. The block is in limiting equilibrium and is just about to move up the plane.