When Xiao Ming calculated a decimal addition, he regarded the 3 in the unit as 8, and the 5 in the percentile as 2, and the result was 23.78. What is the correct answer.
小明在计算一道小数加法时，把个位上的3看成了8，把百分位上的5看成了2，结果是23.78．正确的答案是多少．
<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">23.78 - 5</gadget>
<output>18.78</output>

<gadget id="calculator">0.05 - 0.02</gadget>
<output>0.03</output>

<gadget id="calculator">18.78 + 0.03</gadget>
<output>18.81</output>

<result>18.81</result>