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Weekly pass for hospital parking

A hospital parking lot charges $ 2.50 for the first hour or part thereof, and $1.25 for
each additional hour part thereof. A weekly pass costs $50.00 and allows unlimited parking for 7 days. If each visit Johnny makes to the hospital lasts two and half hours, what is the minimum number of visits that would make it worthwhile to buy a pass?

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If Johnny weren't using the weekly pass, each visit (2.5 hours) will cost him: ...

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