When Xiaofang calculated (4+■)*20, she miscalculated as 4+■*20. How much is the difference between her calculated result and the correct result?
小芳在计算(4+■)*20时错算成4+■*20，她算出的结果与正确的结果相差多少．
<gadget id="calculator">76 + 0</gadget>
<output>76</output>

<result>76</result>