Final answer:
To find out if Susan or Michael has more books, we can calculate the number of books each of them has and compare. If Michael buys 8 more books, Susan will still have more books than him.
Step-by-step explanation:
To solve this problem, we need to find out how many books Susan has. We know that Susan has 50% more books than Michael, who has 40 books. To find out how many books Susan has, we can multiply Michael's number of books by 1.5, since 50% is equivalent to 1.5 times. So, Susan has 40 x 1.5 = 60 books.
If Michael buys 8 more books, he will have a total of 40 + 8 = 48 books. Since Susan has 60 books, she will still have more books than Michael even after he buys 8 more. Therefore, Susan will have more books than Michael.