\(\frac{10}{3}*9^{-\frac{2}{3}}6^{\frac{2}{3}}=\frac{10}{3}*(\frac{6}{9})^{\frac{2}{3}}\approx2.544\) \(\Longrightarrow\) Since Q is the numéraire, the marginal productivity of M is equal to about 2.544.
\(\frac{\partial Q}{\partial A} = \frac{20}{3} M^{\frac{1}{3}}A^{-\frac{1}{3}}\)
\(\frac{20}{3}*9^{\frac{1}{3}}6^{-\frac{1}{3}}=\frac{20}{3}*(\frac{9}{6})^{\frac{1}{3}}\approx 7.631\) \(\Longrightarrow\) Since Q is the numéraire, the marginal productivity of A is equal to about 7.631.