The diagrams illustrate an empty rectangular box and the same box after it has been filled with liquid. The empty box has a mass of $60\,\text{g}$. Once it is filled with liquid, the combined mass of the box and the liquid becomes $300\,\text{g}$. The liquid has a density of $1.2\,\text{g cm}^{-3}$. Calculate the volume of the liquid in the box.
- A$50\,\text{cm}^3$
- B$200\,\text{cm}^3$
- C$250\,\text{cm}^3$
- D$300\,\text{cm}^3$