-------------------------------------------------- Surface area of the cube -------------------------------------------------- 6(2.5 x 2.5) = 37.5m²
(* Each area is 2.5 x 2.5, and there are 6 sides to the cube)
-------------------------------------------------- Surface area of the rectangle prism -------------------------------------------------- 2(11 x 7) + 2(9 x 7) + 2(9 x 11) = 478m²
(* The opposite side of the rectangle area is the same, therefore x2)
-------------------------------------------------- Overlapping area -------------------------------------------------- 2.5 x 2.5 = 6.25m²
-------------------------------------------------- Surface area of the composite figure -------------------------------------------------- 37.5 + 478 - 2(6.25) = 503m²
(* The bottom of the cube and the top of the rectangle prism overlapped, so the area is overlapped twice, minus 2 times of that area)
