The shape is made up of two triangles and a rectangle.
You would have to find the area of the triangles.
A = b * 3 * 0.5
To find the base take 10 - 6 = 4 and divide it by 2 = 2
A = 2 * 3 * 0.5
A = 6 * 0.5
A = 3
So the area of the triangles is 3
Then find the area of the ractangle:
A = b * h
A = 6 * 3
A = 18
Area of the rectangle is 18
So add all the areas
18 + 3 + 3 = 24
Multiply it by the price $4
24 * 4 = 96
It will be $96
Hope this helps ;P