A solution is prepared by dissolving 0.3 g of a non-volatile non-electrolyte solute ' A ' of molar mass $60 \mathrm{~g} \mathrm{~mol}^{-1}$ and 0.9 g of a non-volatile non-electrolyte solute ' $B$ ' of molar mass $180 \mathrm{~g} \mathrm{~mol}^{-1}$ in $100 \mathrm{mLH}_2 \mathrm{O}$ at $27^{\circ} \mathrm{C}$. Osmotic pressure of the solution will be [Given: $\mathrm{R}=0.082 \mathrm{Latm} \mathrm{K}^{-1} \mathrm{~mol}^{-1}$ ]