In 1966, the operative mortality rate in open heart surgery at a certain hospital was 8.1 per 100 cases. By 1974, the operative mortality rate had declined to 4.8 per 100 cases. If the rate declined by 20 percent from 1973 to 1974, by approximately what percent did it decline from 1966 to 1973?
(A) 6%
(B) 21%
(C) 26%
(D) 41%
(E) 49%
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