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9514 1404 393
Answer:
B. 21%
Step-by-step explanation:
The number of students in grade 11-12 is given in the total column: 120.
The number of those who like rock music is given in the second column: 25.
Then the percentage in 11-12 grade who like rock music is ...
25/120 × 100% ≈ 20.833% ≈ 21%