The table given below shows the number of books of different subjects sold by a shopkeeper on a day.
| Subject | Number of books |
| B1 | 180 |
| B2 | 200 |
| B3 | 190 |
| B4 | 210 |
| B5 | 230 |
| B6 | 244 |
The number of B4 books is how much percentage more than that of B1 book?
1
12.12 percent
2
16.66 percent
3
23.33 percent
4
20.66 percent