When Xiaoli calculated A-30.2+6.4, she calculated A-30.2+64 due to sloppy calculations. Compared with the correct result, how much is the difference between the calculated result and the correct result.
小丽在计算A-30.2+6.4时，由于马虎算成A-30.2+64，这样算得的结果与正确结果比较，相差多少．
<gadget id="calculator">64 - 6.4</gadget>
<output>57.6</output>

<result>57.6</result>