Compute and interpret unit rates, including rates with fractional or decimal quantities.
Check a claimed unit rate
Problem
\(\text{Six}~\text{notebooks}\) cost \(\$9\). A student claims the cost is \(\$6~\text{per}~\text{notebook}\). Is the claim correct? If not, what is the corrected cost per notebook?
Big Picture
What this problem is really about
The claim is about dollars for one notebook, so we’ll test it against the full purchase before calculating a replacement. First multiply the claimed per-notebook cost by six and compare that product with the nine-dollar total. Then divide total dollars by notebooks and multiply back to verify the corrected unit rate.
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