When Xiaohua was calculating a decimal subtraction problem, he regarded 2 in the tenth place of the subtrahend as 5, and 6 in the minus percentile as 9. How far is the wrong answer from the right answer?
小华在计算一道小数减法算式题时，把被减数十分位上的2看成了5，把减数百分位上的6看成了9．错误的答案与正确的答案相差多少？
<gadget id="calculator">0.5 - 0.2</gadget>
<output>0.3</output>

<gadget id="calculator">0.09 - 0.06</gadget>
<output>0.03</output>

<gadget id="calculator">0.3 - 0.03</gadget>
<output>0.27</output>

<result>0.27</result>