And then our last rectangle, our change in time, we go from 24 to 40, so our change in time is 16, times the height at 40, what was that? That was 150 I think. Yep, that was 150. So times 150. 150. And so just to make clear what I just did, I'm just adding up the sums of the areas of these rectangles. The area of this rectangle is 12 times 200.