Solution:
total students: 243 + 567: 810
Students who wore costumes: 243
Students who did not wear costumes: 567
Now, the percentage of students who wear a costume is given by the following diagram:
By cross-multiplication, we get:
[tex]x\text{ (810)=(100)(243)}[/tex]solving for x, we get:
[tex]x\text{ = }\frac{(100)(243)}{810}=30[/tex]so that, the correct answer is:
30 percent.
