Here is a table that will help you understand. And the answer.
We did this same kind of problem in school. All we did was divide the those 2 numbers to figure out the unit price. So, 20/5 = 4 $ per CD.
Answer:
4
Step-by-step explanation:
3n-(2+n)
3(4)-(2+4)
12-(6)
12-6
6