AMC 8 2011 Problem 7

Each of the following four large congruent squares is subdivided into combinations of congruent triangles or rectangles and is partially bolded. What percent of the total area is partially bolded?

$\textbf{(A) }12\frac{1}{2} \textbf{(B) }20 \textbf{(C) }25 \textbf{(D) }33\frac{1}{3} \textbf{(E) }37\frac{1}{2}$