Four squares of side length 44, 77, 99, and 1010 units are arranged in increasing size order so that their left edges and bottom edges align. The squares alternate in color white-gray-white-gray, respectively, as shown in the figure. What is the area of the visible gray region in square units?
A. 42
B. 45
C. 49
D. 50
E. 52

Perimeter area composite中文
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E. 52

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