the kilopascal is a unit of measure for atmospheric pressure. suppose the atmospheric air pressure at sea level is about 103 kilopascals. for every 1000-m increase in altitude, the pressure decreases about 11.1%. what is the approximate pressure at an altitude of 3000m?
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Apparently the answer is 72, but how do I get 72?

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what is 88.9% of 103 ?

where did you get 100 from?

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