Which of the following is not a rate?

A florist charges $36 for a dozen roses.
A florist charges $36 for a dozen roses.

The number of roses in a special Valentine's Day bouquet is 18.
The number of roses in a special Valentine's Day bouquet is 18.

The florist pays his employees $12.25 per hour.
The florist pays his employees $12.25 per hour.

The employee at the florist works 40 hours a week.