I think there might be a mistake/typo. If the book had 385 pages, the answer would be 8,855. But it says the book has 365 pages, so the answer would be 8,395.
Reasoning:
It says to multiply the pages by 23, and it says there are 365 pages. When you multiple that, you get 8,395.
Therefore I think there was a mistake when writing the question.