\[\boxed{\mathbf{2.}\mathbf{308}}\]
\[\textbf{а)}\ 45\% = 0,45\]
\[45\% = \frac{45}{100} = \frac{9}{20}\]
\[\textbf{б)}\ 56\% = 0,56\]
\[56\% = \frac{56}{100} = \frac{14}{25}\]
\[\textbf{в)}\ 75\% = 0,75\]
\[75\% = \frac{75}{100} = \frac{3}{4}\]
\[\textbf{г)}\ 120\% = 1,2\]
\[120\% = \frac{120}{100} = \frac{12}{10} = \frac{6}{5} = 1\frac{1}{5}\]
\[\textbf{д)}\ 150\% = 1,5\]
\[150\% = \frac{150}{100} = \frac{3}{2} = 1\frac{1}{2}\]