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Multiplied by 3 instead of dividing by 3. % increase?
  1. 200%
  2. 400%
  3. 600%
  4. 800%
Explanation

Let the original number be x


Correct result: x ÷ 3


Wrong result: x × 3


Now, compare:


Increase = (x×3 − x/3) = (9x − x)/3 = 8x/3

% Increase = (8x/3) ÷ (x/3) × 100 = 800%

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