Answer: You can buy eight cd for $120.
One cd is $15
two cd is $30
three cd is $45
four cd is $ 60
five cd is $ 75
six cd is $90
seven cd is $105
eight cd is $120
Explanation:
you can check by adding 60 plus 60 equal 120.
you can multiply 15 times 8 equal 120.
you can divide 120 by 15 equal 8.