A1. To what decimal number is the ratio of the areas of rectangles $A E F D$ and $A B C D$ (see figure) equal?
(A) 0.2
(B) 0.3
(C) 0.4
(D) 0.5
(E) 0.6
A1. The ratio of the areas $p_{A E F D}$ and $p_{A B C D}$ is equal to $\frac{2}{5}=0.4$.