\[Страница\ 61.\]
\[\boxed{\mathbf{15.}}\]
\[\textbf{а)}\ 23,4\ :46,8 \cdot 100 =\]
\[= 0,5 \cdot 100 = 50\%\]
\[\textbf{б)}\ 30\ :0,3 \cdot 100 = 100 \cdot 100 =\]
\[= 10\ 000\%\]
\[\textbf{в)}\ 4\frac{1}{8}\ :8\frac{1}{4} \cdot 100 =\]
\[= \frac{33}{8} \cdot \frac{4}{33} \cdot 100 = 0,5 \cdot 100 = 50\%\]
\[\textbf{г)}\ 119\ :700 \cdot 100 = 119\ :7 =\]
\[= 17\%\]