"Easy Rider'' died last year. Christie's said the Mao print that sold Tuesday was accessorized with two bullet holes. It happened during a wild night when Hopper mistook the portrait for Mao himself and shot at it.
Hopper showed the bullet punctures to Warhol, and the pair agreed to call the work a collaboration.
The sale price included the auction house's commission. The presale estimate for the print was $20,000 to $30,000. Christie's did not identify the buyer.