Answer:
Percentage of fiction books = 80%
Explanation:
Total number of books in the town's library = 5,000
Total number of fiction books in the library = 4,000
To find the percent of fiction books, we will set up the equation as following.
⇒

Substituting the known values and evaluating to find percentage.
⇒

⇒
[simplifying]
⇒

Percentage of fiction books = 80%