When Xiaogang was calculating a subtraction problem, he regarded the subtrahend 7.8 as 78, and the result was 24.2. What is the correct result?
小刚在计算一道减法题时，将减数7.8看成了78，结果是24.2，正确的结果是多少？
<gadget id="calculator">78 - 7.8</gadget>
<output>70.2</output>

<gadget id="calculator">24.2 + 70.2</gadget>
<output>94.4</output>

<result>94.4</result>