A measuring cylinder initially holds $30\,\text{cm}^3$ of a liquid. Further liquid is then added until the level comes to the $50\,\text{cm}^3$ mark. The reading on the balance goes up by $30\,\text{g}$. Determine the density of the liquid.
- A$0.60\,\text{g cm}^{-3}$
- B$0.67\,\text{g cm}^{-3}$
- C$1.5\,\text{g cm}^{-3}$
- D$1.7\,\text{g cm}^{-3}$