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Dr North piegan's practice sees 125 cats in 2010 24.8% of cats were classified as obese compared to 21.6 person in 2011 find the percent decrease in obese cat in one year

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Apologiabiologyid
so in 2010 the % obese is 24.8%
in 2011 the % obese is 21.6%
so you subtract 21.6 from 24.8 and get 3.2%