At the start of a certain week, a School library had 100 comic books, all of which were on the shelf on Monday morning. 25% of the comic books issued on Tuesday and 12.5% of the comic books issued on Wednesday were returned by Saturday morning. Books are issued only on Tuesdays and Wednesdays. Number of comic books issued on Wednesday were twice the number of comic books issued on Tuesday during that week. If there are at least 40 comic books in the library that Saturday morning, what could be the greatest number of books that could be issued during that week?