Answer:
The total amount of screen needed is 22 ft^2
Explanation:
see the attached figure to better understand the problem
we know that
The surface area of a rectangular prism is equal to

where
B is the area of the base
P is the perimeter of the base
h is the height of the rectangular prism
Find the area of the base B

Find the perimeter of the base P

The height of the prism h is

substitute the values


The total amount of screen needed is 22 ft^2