what will be the output of following code function fn var..., PHP Functions, PHP

Question:What will be the output of the following code?
function fn(&$var)
{
   $var = $var - ($var/10 *5);
    return $var;

  }
echo fn (100);

A 100 
B 50 
C 98 
D Error message 
E None of the above

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Question:What will be the output of the following code? function fn(&$var) { $var = $var - ($var/10 *5); return $var; } echo fn (100);