Respuesta :

Answer:

$342

Step-by-step explanation:

[Total books] 6 + 9 + 4 = 19 books

[Price] 19 * 18 = $342

Have a nice day!

    I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)

- Heather