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Question
Hello:

An example of a common rate is miles per hour as in 60 miles per hour.

Is the following example considered a rate even though one of the units is not a unit of measure?

A department store has on sale four tires for \$240, 4 tires/\$240. Is this example still a rate?  "Dollars is a unit of measure but "tires" is not.

kenneth~

four tires for \$240 can be written as \$240 per four tires or \$60 per tire which is a rate by the definition found in wikepedia
"a rate of change can be specified per unit time, or per unit of length or mass or ANOTHER QUANTITY.

Professor Wallin
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