Calculate the volume of the hollow prism.

The outer dimensions of the prism are 20 cm x 12 cm x 2 cm. The inner dimensions are 8 cm x 12 cm. The volume of the outer prism is $$20 \times 12 \times 2 = 480$$ cm$$^3$$. The volume of the inner hollow space is $$8 \times 12 \times 2 = 192$$ cm$$^3$$. The volume of the material is $$480 - 192 = 288$$ cm$$^3$$.