\(\Leftrightarrow\left\{{}\begin{matrix}\dfrac{28}{25}x+\dfrac{28}{25}y=\dfrac{2016}{5}\\\dfrac{28}{25}x+\dfrac{11}{10}y=400\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=160\\x=200\end{matrix}\right.\)
\(\left\{{}\begin{matrix}x+y=360\\112\%x+110\%y=400\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x+y=360\\\dfrac{28x}{25}+\dfrac{11y}{10}=400\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x+y=360\\\dfrac{56x}{50}+\dfrac{55y}{50}=400\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x+y=360\\\dfrac{56x+55y}{50}=400\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x+y=360\\56x+55y=20000\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=200\\y=160\end{matrix}\right.\)
