A1. What percentage of the total area of all shapes in the image is shaded?
(A) 12.5
(B) 20
(C) 25
(D) $33 \frac{1}{3}$
(E) $37 \frac{1}{2}$
A1. In the first square, $\frac{1}{4}$ of the shape is shaded, in the second $\frac{1}{8}$, in the third $\frac{3}{8}$, and in the fourth $\frac{1}{4}$ of the shape. Together, 1 whole shape out of four is shaded, which represents $25 \%$.