A teacher assigned five problems, A, B, C, D, and E. Not all students turned in answers to all of the problems. Here is a tally of the percentage of students turning in various combinations of problems:

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A; 46% B; 40% C: 43% D; 38% E; 41% A, B; 25% B, C; 26% C, D; 26% D, E; 22% A, E; 30% A, B, C; 13% A, B, E; 19% A, D, E; 16% B, C, D; 12% C, D, E; 14% A, B, C, D; 7% A, B, C, E; 8% A, B, D, E; 9% A, C, D, E; 11% B, C, D, E; 6% A, B, C, D, E; 4% What percent of the students did not turn in any problems? Assume that no students turned in combinations not listed.