Answer
$69,700\ mm^3$
Work Step by Step
The volume of a pyramid is given by
$$
V=\frac{1}{3} Bh=\frac{1}{3} \times \frac{1}{2} \times101\times 115\times 36= 69690\ mm^3\approx 69,700\ mm^3
$$
where $B$ is the area of the base (right triangle with area $\frac{1}{2}bh$) and $h$ is the height of the pyramid.
