On a certain test, 3 students each had a score of 90, 9 students each had a score of 80, 4 students each had a score of 70, and 4 students each had a score of 60. What was the average (arithmetic mean) score for the 20 students ?
(A) 70.5
(B) 75.0
(C) 75.5
(D) 80.0
(E) 80.5
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