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Why is calculating a profit margin as a calculated column and then summing it wrong?

  1. A Summing percentages produces a meaningless total
  2. B Calculated columns cannot hold decimals
  3. C It uses too much memory
  4. D Percentages cannot be aggregated in Power BI
Answer

Summing percentages produces a meaningless total

The correct approach is a measure dividing the summed numerator by the summed denominator, which is right at every aggregation level.

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