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<p>If a donor restricts the funds for undergraduate financial aid purposes only, then the university can only extract money from that fund only. WashU has like $435 million dedicated for fin aid within its multi billion dollar endowment. If you want student related and student specific numbers, endowment (which encompasses research, faculty salaries support, administrative cost, building maintenance, sports recreation athletic support) includes figures that is not relevant to the amount spent on students themselves.</p>