Answer:
At most 8
Explanation:
First he spends 9,25 x 3 = 27.75 dollars on comic books.
Then he needs to save 12 dollars for the comic book fest.
This means he has 50 - 27.75 - 12 = 10,25 dollars left for plastic book covers.
Each plastic book cover is 1.15 dollars so he can buy 10.25 ÷ 1.15 = 8,91 plastic book covers.
Round it down to the nearest whole number and you get at most 8.