<Li> Each piano tuner works eight hours in a day, five days in a week, and 50 weeks in a year . </Li> <P> From these assumptions, we can compute that the number of piano tunings in a single year in Chicago is </P> <Dl> <Dd> (9,000,000 persons in Chicago) ÷ (2 persons / household) × (1 piano / 20 households) × (1 piano tuning per piano per year) = 225,000 piano tunings per year in Chicago . </Dd> </Dl> <Dd> (9,000,000 persons in Chicago) ÷ (2 persons / household) × (1 piano / 20 households) × (1 piano tuning per piano per year) = 225,000 piano tunings per year in Chicago . </Dd>

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