How many smoke detectors do I need?

There should be at least one detector in every occupied bedroom and one on every floor of the house except attics, unless the attic space is used for sleeping. Additional detectors will increase the chance of early detection.

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1. How much does a smoke detector cost?
2. What kind of smoke detector should I buy?
3. How many smoke detectors do I need?
4. Where should I place a detector?
5. How do I install a smoke detector?
6. What maintenance do smoke detectors require?
7. Is there anything else I should do with my smoke detector?