Children's fairy tales account for 50/360= 13.89% of the total number of books.
The percentage of popular science books in the total number of books is 200/360=55.56%.
The percentage of classics in the total number of books is 100/360=27.78%.
The percentage of sports art books in the total number of books is 10/360=2.78%.
Because division is endless, it is all approximate.