The vapour phase composition and relative volatilities (with respect to $n$-propane) on an ideal tray of a distillation column are

$$\begin{array}{clcIcIcI|cI|c}\hline

&\textbf{Component} & \textbf{Methane} & \textbf{Ethane} & \textbf{n-Propane} \\ \hline &\text{Mole fraction in vapour} & \text{0.12} & \text{0.28} & \text{0.60} \\ &\text{Relative volatility} & \text{10} & \text{4} & \text{1} \\ \hline \end{array}$$

The mole fraction of $n$-propane in the liquid phase, rounded to $2$ decimal places, is ___________________.