Explanation:
First, you divide the money by how many notebooks/folders you can get.
Folders: $2.50 / 10 = $0.25
Notebook: $7.00 / 4 = $1.75
Now, you just multiply the notebooks and folders.
6 folders x $0.25 = $1.50
5 notebooks x $1.75 = $8.75
$1.50 + $8.75 = $10.25
Answer: $10.25