Answer:
it’s between 7 and 8
Step-by-step explanation:
if that doesn’t help sorry I tried
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.
Use dimensional analysis:

Since we multiplied a numerator and a denominator by centimeters, we are only left with meters.
This answer is already is three significant figures by default.