Comet operates solely within the United States. It owns two subsidiaries conducting business in the United States and several foreign countries. Both subsidiaries are U.S. corporations. This year, the three corporations report the following: Foreign Source Income 0 $3,650,000 4,250,000 Foreign U.S. Source Income Tax Income Paid $ 617,500 162,000 $ 362,000 635,000 1,205,000 Comet Sub 1 Sub 2 a. If Comet and its two subsidiaries file a consolidated U.S. tax return, compute consolidated income tax. b. What is the aggregate tax of the group if the three corporations file separate U.S. tax returns