Interpret complex expressions by treating meaningful sub-expressions as single units.
Choose the unit of a sub-expression
Problem
What is the meaningful unit of the sub-expression \(5n\) in this context: \(5~\text{dollars}~\text{per}~\text{ticket}\) times \(n~\text{tickets}\)?
Big Picture
What this problem is really about
Units multiply along with numerical factors. We’ll write the rate as output units per input unit, attach the count’s input unit, and cancel matching units in the product. The unit that remains should agree with the contextual shift from a price for one item to an amount for all counted items.
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