Study the given table and answer the question that follows.
Find the difference between the number of female students and male students who opted biology in school C.
| School name | Total number of students enrolled | Percentage of enrolled students, opted Biology | Ratio of male to female students who opted Biology |
| A | 900 | 30 | 7 ∶ 8 |
| B | 400 | 38 | 9 ∶ 10 |
| C | 1000 | 24 | 1 ∶ 2 |
| D | 800 | 18 | 5 ∶ 7 |
1
240
2
160
3
200
4
80