When Tashi calculated a one-digit decimal minus 2.46, the difference was 39.54 because he missed the decimal point of the one-digit decimal. What is the correct result?
扎西在计算一个一位小数减2.46时，由于漏掉了这个一位小数的小数点，得到的差是39.54，正确的结果是多少？
<gadget id="calculator">4.2 - 2.46</gadget>
<output>1.74</output>

<result>1.74</result>