To find the surface area of the square pyramid, we first need to find the area of each triangular face and the area of the square base.
The area of the square base is 15 feet * 15 feet = 225 ft^2.
To find the area of each triangular face, we need to find the slant height. Using the Pythagorean theorem, we can calculate the slant height:
Slant height = sqrt(9.9^2 + (15/2)^2)
Slant height = sqrt(98.01 + 112.5)
Slant height = sqrt(210.51)
Slant height ≈ 14.5 feet
Now we can find the area of one triangular face:
Area = (1/2) * base * height
Area = (1/2) * 15 * 14.5
Area ≈ 108.75 ft^2
Since the pyramid has 4 identical triangular faces, the total surface area is:
Total surface area = 4 * (area of one triangular face) + area of the square base
Total surface area = 4 * 108.75 + 225
Total surface area = 435 + 225
Total surface area = 660 ft^2
Therefore, the correct answer is not listed. The surface area of the square pyramid is 660 ft^2.