\[125x \cdot ( - 0,8y) = - 100xy\]
\[x = - 1\frac{1}{24};\ \ y = - 3\frac{3}{5}:\]
\[- 100xy =\]
\[= - 100 \cdot \left( - 1\frac{1}{24} \right) \cdot \left( - 3\frac{3}{5} \right) =\]
\[= - \frac{100 \cdot 25 \cdot 18}{1 \cdot 24 \cdot 5} = - 375.\]