A horizontal beam is hinged at X. A mass of $200\,\text{g}$ is placed on the beam, as shown. The beam’s centre of mass is $50\,\text{cm}$ from the beam’s right-hand end. The beam stays balanced. Determine the mass of the beam.
- A$80\,\text{g}$
- B$100\,\text{g}$
- C$400\,\text{g}$
- D$800\,\text{g}$