Presley is organizing the school book sale. Each stall will have 40 books on the shelf and 2 boxes of books with b books inside. Presley also has 200 books in inventory to refill the shelves as books sell. This situation can be written as the following expression:
40s + (2b)s + 200
How many books should Presley have ready if she plans to open 8 stalls and have 12 books in each box?
520
712
820
1,622