What is the surface area of the figure? 7ft 7ft 12ft 12ft 5ft

This shape seems to be like a rectangular prism because of its dimensions
7 ft × 2 (widths)
12 ft × 2 (lengths)
5 ft (height of prism)

Formula of the surface area of a prism is:
2 × Area of base + Perimeter × Height of prism
Area of rectangle (length × width)
Perimeter of rectangle (2×length + 2×width)
2 × (12 × 7) +(2×12+2×7) × 5
168 + 190
358 ft²

It says in the questions that it is 6.5?