Final answer:
Total surface area calculation requires detailed dimensions of the barn's sides, walls, and roof, which are not provided. Need more information to accurately calculate the area needed for repairs.
Step-by-step explanation:
The given problem pertains to the calculation of the total surface area of a barn, including the roof, that needs repairs based on previous calculations provided in parts b and c which are related to different scenarios. Unfortunately, without the specific dimensions of the barn and complete information from parts b and c regarding this scenario, it is not possible to accurately calculate the total surface area for repairs. You may need to provide detailed dimensions of the barn's sides, walls, and roof, and specify whether it includes features such as overhangs or not. In general, to find the total surface area of a barn, you would sum the areas of its walls and roof.