2 square pyramids are stacked on their bases. The bases are 2 inches by 2 inches and each pyramid has a height of 3.25 inches.
A cardboard party favor is shaped like two square pyramids stuck together at their bases.

What is the approximate volume of the party favor?
4.3 in.3
8.7 in.3
12.9 in.3
26.1 in.3