If $x$ is $25\%$ of $y$, then $y$ is what percent of $x$?

If $x$ is $25\%$ of $y$, then $y$ is what percent of $x$?
  1. $25\%$
  2. $75\%$
  3. $200\%$
  4. $400\%$

Solution

$x = \dfrac{1}{4} y \Rightarrow y = 4x = 400\%$ of $x$.

Asked in: IMO

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