Question: At a certain bookstore, the best-selling book, "TOP," costs $8. The least-selling book, "ABC," costs $23. Thirteen "TOP" books and four "ABC" books were sold last week. What is the difference in the bookstore's earnings on these two books last week? Is final answer 12?
Answer: On "TOP" books the bookstore made 13 * 8 = $<<13*8=104>>104.
The "ABC" books, on the other hand, were sold for a total of 4 * 23 = $<<4*23=92>>92.
The difference between earnings from these two books is 104 - 92 = $<<104-92=12>>12.
#### 12