1/3x4x4x8xpi=128/3pi
Second option is the answer.
X intersects at -2, and y is 8
check the picture below.
so as you can see, the box is simply 6 rectangles stacked up to each other at the edges.
so we can simply get the area of each rectangle and sum them up and that's the area of the rectangular prism.

If it is 30% off, then ur paying 70%
0.70(85) = 59.50
or
85 - 0.30(85) = 85 - 25.50 = 59.50