In GSB 420, 20% of the students get an A; 30%, a B; 40%, a C; and 10%, a D. On a survey, 90% of students with an A said they studied very hard for the exam; 70% of students with a B said they studied very hard for the exam; 40% of students with a C said they studied very hard for the exam; and 20% of students with a D said they studied very hard for the exam.
The probability of finding a student who said he/she studied very hard for the exam is
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