Let $$A= \left[\begin{array}{cc} 2 &6\cr 1 &8 \end{array}\right] \ \mbox{ and } B= \left[\begin{array}{cc} 9 &4\cr 0 &7 \end{array}\right].$$ Find the matrix $C$ of the linear transformation $\ T(x)=B(A(x)).$

$C=$ $\left[\Rule{0pt}{2.4em}{0pt}\right.$$\left]\Rule{0pt}{2.4em}{0pt}\right.$