what will be the output of following codefunction fn var..., PHP Fundamentals, 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 massage 
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);