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1212The surface area of a cube is , where s is the side length of the cube. So, gives 8 = s.
The volume of a cube is , so the cube's volume is .
The volume of a square pyramid is , where B is the area of the square base and h is the height, so the pyramid's volume is .
The combined volume of the pyramid and cube is 512 + 24 = 536, and 25% smaller than this volume is the same as multiplying the volume by 0.75, which gives 536(0.75) = 402.