When Xiaohua calculates a decimal subtraction, he regards the 8 in the tenth place of the subtrahend as 3, and the 1 in the minus percentile as 7. Calculate the difference between the wrong answer and the correct answer.
小华在计算一道小数减法时，把被减数十分位上的8看成了3，把减数百分位上的1看成了7．算出的错误答案与正确答案相差多少．
<gadget id="calculator">0.8 - 0.3</gadget>
<output>0.5</output>

<gadget id="calculator">0.07 - 0.01</gadget>
<output>0.06</output>

<gadget id="calculator">0.5 + 0.06</gadget>
<output>0.56</output>

<result>0.56</result>