Nevermark on Designing content for people who struggle with numbers

It comes down to two ways to measure change: absolute (additive) difference and relative (multiplicative) difference.

Additive:

  “The price went up 200%”

  New price = 100% + 200% = 300%

  (1.00 + 2.00 = 3.00)

Multiplicative:

  “The price is 300% of the original”

  New price = 100% x 300% = 300%

  (1.00 x 3.00 = 3.00)

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