Find the surface area of the pyramid. The perpendicular height is 8mm. The base is a square with the edge of 10mm. Include all faces in your calculations.

Round your answer to two decimal places.
Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: Find the surface area of the pyramid. The perpendicular height is 8mm. The base is a square with the edge of 10mm. Include all faces in your calculations.

Round your answer to two decimal places.
Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: Find the surface area of the pyramid. The perpendicular height is 8mm. The base is a square with the edge of 10mm. Include all faces in your calculations.

Round your answer to two decimal places.