When Zhang Ming calculated 13.6*8.3 with a calculator, he entered 12.6*8.3 by mistake. What should he do to correct this mistake? how much to add
张明用计算器计算13.6*8.3时，错误地输入了12.6*8.3，他需要怎么做才能修正这个错误？加多少
<gadget id="calculator">13.6 * 8.3</gadget>
<output>112.88</output>

<gadget id="calculator">12.6 * 8.3</gadget>
<output>104.58</output>

<gadget id="calculator">112.88 - 104.58</gadget>
<output>8.3</output>

<result>8.3</result>