A firm builds wooden shipping crates. How does the cost of producing a 1-cubic-foot crate (each side

Question:

A firm builds wooden shipping crates. 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 per square foot and the firm has no labor or other costs? More generally, how does cost vary with volume?