CEMC Cayley, 2011

Algebra Difficulty 2.0 Junior Find the answer Canada

Four congruent rectangles and a square are assembled without overlapping to form a large square, as shown. Each of the rectangles has a perimeter of $40$ cm. The total area of the large square is

(A) $160$ cm $^2$ (B) $200$ cm $^2$ (C) $400$ cm $^2$ (D) $800$ cm $^2$ (E) $1600$ cm $^2$

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