Answer:
6 notebooks for 5.25 is a BETTER BUY.
Step-by-step explanation:
Here, according to the question:
A) 8 notebooks sells for 7.15
![\textrm{Cost of 1 notebook} = \frac{\textrm{Cost of n notebooks}}{\textrm{n}}](https://tex.z-dn.net/?f=%5Ctextrm%7BCost%20of%201%20notebook%7D%20%3D%20%5Cfrac%7B%5Ctextrm%7BCost%20of%20n%20notebooks%7D%7D%7B%5Ctextrm%7Bn%7D%7D)
So, here cost of 1 notebook = ![(\frac{7.15}{8} ) = 0.893](https://tex.z-dn.net/?f=%28%5Cfrac%7B7.15%7D%7B8%7D%20%29%20%3D%200.893)
⇒Here the cost of 1 notebook = $0.893
B) 6 notebooks sells for 5.25
![\textrm{Cost of 1 notebook} = \frac{\textrm{Cost of n notebooks}}{\textrm{n}}](https://tex.z-dn.net/?f=%5Ctextrm%7BCost%20of%201%20notebook%7D%20%3D%20%5Cfrac%7B%5Ctextrm%7BCost%20of%20n%20notebooks%7D%7D%7B%5Ctextrm%7Bn%7D%7D)
So, here cost of 1 notebook = ![(\frac{5.25}{6} ) = 0.875](https://tex.z-dn.net/?f=%28%5Cfrac%7B5.25%7D%7B6%7D%20%29%20%3D%200.875)
⇒Here the cost of 1 notebook = $0.875
Now, as we can see $0.893 > $0.875
⇒ the cost of 1 notebook is MORE if we buy 8 notebooks sells for 7.15.
Hence, 6 notebooks for 5.25 is a BETTER BUY.