J.P. Jones, who is a citizen and resident of a foreign country with which the U.S. does not have an income tax treaty, was temporarily sent to the United States for technical training by her employer, JBJ Corporation, a U.S. corporation. Usually Jones is employed in JBJ's sales office in the foreign country. Jones was present in the United States for a total of six weeks during 2015. Her pay while in the United States was $600 per week (gross). What portion of Jones' income will be taxable in the United States?