选择题

2011 AMC 8 Problem 7: Bolded Area Percent

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?

A.
12 1/2
B.
20
C.
25
D.
33 1/3
E.
37 1/2