She spended $7.50 on each book- If the camp leader has 12 campers how much does she spend on the books

$90 (assuming 1 book per camper)

Step-by-step explanation:

We are not told the number of books per camper.

If each camper gets 1 book, then since there are 12 campers, then there are 12 books.

12 * $7.50 = $90

(BTW, the word "spended" does not exist. The correct word is "spent.")

If you are looking for the volume, it is 672 inches cubed.

Step-by-step explanation:

Volume is length times width times height, so...

8 x 14 x 6 = 672