A firm builds shipping crates out of wood. How does the cost of producing a 1-cubic-foot crate

Question:

A firm builds shipping crates out of wood. How does the cost of producing a 1-cubic-foot crate (each side is 1-foot square) compare to the cost of building an 8-cubic-foot crate if wood costs $ 1 a square foot and the firm has no labor or other costs? More generally, how does cost vary with volume?