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Sep 19th, 2019
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  1. Prisen på en liter økologisk mælk stiger fra 9 til 10 kr.
  2. Slut pris minus begyndelses pris 10-9 = 1kr
  3. 1/9≈0,1111111=11,1%
  4. Prisen på en sodavand falder fra 10 til 9 kr.
  5. 9-10=-1
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