Comprehension Passage
Directions: Read the following information carefully and answer the following questions.
Given table shows the number of fiction books sold by a bookstore in four different months.
| Months | Number of fiction books sold |
| January | 520 |
| Till February | 810 |
| Till March | 1080 |
| Till April | 1220 |
If the ratio of fiction and comic books sold in March is 3 : 7 respectively, then find the number of comic books sold in March.
1
630
2
770
3
540
4
720
5
Cannot be determined