Answer:
145 yards squared
Step-by-step explanation:
So the area of the base is area of a square with side length of 5 yards 
The area of one triangular face base times height divided by two and then simply multiplied by 4 because there are 4 triangular faces.

So the total surface area is
yards squared
Constants are 4,3. The coefficient is 4.
Here is my work for the problem. Hope this helps!
Extra 10, 10 is half of what she ordered so she received an extra 50%