At a used book sale, Miss Chan bought a box of 20 assorted books for $40 what was the cost per book?
To find the cost per book, we need to divide the total cost by the number of books.
Total cost of box of books = $40
Number of books = 20
Cost per book = Total cost / Number of books
Cost per book = $40 / 20
Cost per book = $2
The cost per book is $2.