Calculate the difference in percentage

This function will calculate the difference in % between X and Y. X must be less then Y.

function CalcDiffPer($n1, $n2)
{
   if ($n2 < $n1) list($n1, $n2) = array($n2, $n1);
   return sprintf('%.1f', (100 - ( ($n1 / $n2) * 100))).'%';
}

echo CalcDiffPer(75,100);

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