A bookstore advertises 5 notebooks for $7.50. At this rate, how much would 8 notebooks cost

Hi!

The answer would be $12, because if we multiply 7.50 by 8 we get 60 and when we divide that by 5 we get 12.

8 notebooks would cost $12

Proportion:

5 nb/8 7.50/x

Cross multiply

7.50 times 8=60

60 divided by 5=12

Well first you need to divide 7.50 by 5. You get 1.50 so then you multiply 1.50 by 8 & get $12