ANSWER
62.5%
EXPLANATION
Out of 400 students, 250 girls said Mean Girls was their favorite movie.
To find the percentage of girls that said Mean Girls was their favorite movie, we have to divide the number of girls that said that by the total number of people that participated in the survey and multiply by 100.
That is:
[tex]\text{ \%MG = }\frac{250}{400}\cdot\text{ 100 = 62.5\%}[/tex]That is the answer.