Riverbend Semiconductor Corporation (RSC) is an Arizona corporation engaged in the manufacture and sale of semiconductors and other computer equipment. RSC spent $3 million on research and experimentation costs, and all its research and experimentation activity was conducted in the United States. The company handles its export sales through sales branches in Ireland and Taiwan. Total foreign sales from the foreign branches were $8 million and worldwide sales were $20 million. What amount of the total research and experimentation expense will be apportioned to foreign source income?