1. Engco, a domestic corporation, produces industrial engines at its U.S. plant for sale in the United States and Canada. Engco also has a plant in Canada that performs the final stages of production with respect to the engines sold in Canada. All of the output of the Canadian plant is sold in Canada, whereas only one-third of the output of the U.S. plant is shipped to Canada. The Canadian operation is classified as a branch for U.S. tax purposes. During the current year, Engco