Question

Which rate is NOT a unit rate?

20 bubbles every second
3000 bottles per minute
$13.50 each hour
15 drops in one day
3 books for 2

Answer 1

Answer: 3 books for 2.

Since a unit rate is a comparison of a number to 1,

There is no comparison to 1 at all in 3 books for 2.

Therefore, your answer is concluded to be 3 books for 2.

Answer 2

3 books for 2

Explanation:

A unit rate is the amount of something for one singular unit, therefore the last one is not a unit rate.