Calchy.
Math - percentage change

What is the percentage change from 80 to 100?

Answer
+25.00
%
((100 − 80) ÷ 80) × 100 = 25.00%
How we got there
  1. 01Difference: 100 − 80 = 20.00
  2. 02Divide by start: 20.00 ÷ 80 = 0.2500
  3. 03Convert to %: × 100 = 25.00% (increase)
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