A uniform rod with length $200\text{ cm}$ is mounted so that it can pivot freely at point $P$. It is kept horizontal in equilibrium by a $60\text{ N}$ weight, which is attached to the rod by a string passing over a frictionless pulley. What is the weight of the rod?
- A$30\text{ N}$
- B$60\text{ N}$
- C$80\text{ N}$
- D$140\text{ N}$