gwd 6-m-33请大家指点

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gwd 6-m-33 Q33: Enrollment in City College in 1980 was 83⅓ percent of enrollment in 1990. What was the percent increase in the college’s enrollment from 1980 to 1990? A. 10% B. 16⅔% C. 20% D. 25% E. 183⅓% 请问这道题怎么做呀1/3是表示根3吗？