$ABCD$ is a rectangle that is four times as long as it is wide. Point $E$ is the midpoint of $\overline{BC}$. What percent of the rectangle is shaded?

[asy]
draw( (0,0) -- (4,0) -- (4,1) -- (0,1) -- cycle);draw( (2,0) -- (0,1) ); draw( (4,0) -- (0,1));
fill( (0,0) -- (0,1) -- (2,0) -- cycle, gray); fill( (0,1) -- (4,0) -- (4,1) -- cycle, gray);
label("$A$", (0,1) , NW); label("$B$", (0,0) , SW); label("$C$", (4,0) , SE);label("$D$", (4,1) , NE);label("$E$", (2,0), S);
[/asy]
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
$ABCD$ is a rectangle that is four times as long as it is wide. Point $E$ is the midpoint of $\overline{BC}$. What percent of the rectangle is shaded?

[asy]
draw( (0,0) -- (4,0) -- (4,1) -- (0,1) -- cycle);draw( (2,0) -- (0,1) ); draw( (4,0) -- (0,1));
fill( (0,0) -- (0,1) -- (2,0) -- cycle, gray); fill( (0,1) -- (4,0) -- (4,1) -- cycle, gray);
label("$A$", (0,1) , NW); label("$B$", (0,0) , SW); label("$C$", (4,0) , SE);label("$D$", (4,1) , NE);label("$E$", (2,0), S);
[/asy]
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
75
$ABCD$ is a rectangle that is four times as long as it is wide. Point $E$ is the midpoint of $\overline{BC}$. What percent of the rectangle is shaded?

[asy]
draw( (0,0) -- (4,0) -- (4,1) -- (0,1) -- cycle);draw( (2,0) -- (0,1) ); draw( (4,0) -- (0,1));
fill( (0,0) -- (0,1) -- (2,0) -- cycle, gray); fill( (0,1) -- (4,0) -- (4,1) -- cycle, gray);
label("$A$", (0,1) , NW); label("$B$", (0,0) , SW); label("$C$", (4,0) , SE);label("$D$", (4,1) , NE);label("$E$", (2,0), S);
[/asy]
train