The perimeter of the bottom surface of a cube is 20 decimeters. What are its surface area and volume

The perimeter of the bottom surface of a cube is 20 decimeters. What are its surface area and volume

Bottom side length = 20 / 4 = 5 decimeters
Surface area = 5 × 5 × 6 = 150 square decimeters
Volume = 5 × 5 × 5 = 125 cubic decimeter