Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
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?

### Response:
 ผลต่างของรายได้คือ ($8 - $23) x (13 - 4) = <<8-23=-15>>-15 x 9 = -$<<-15*9=-135>>135