When Xiaowei calculated the addition of decimals, he wrote 1 by mistake for the 7 in the percentile of the first addition, and 9 for the 6 in the tenth place of the second addend, so the calculated sum was 6.02. What is the correct sum?
小伟在计算小数加法时，把第一个加数百分位上的7错写成1，把第二个加数十分位上的6错写成了9，这样算得的和是6.02．正确的和应是多少？
<gadget id="calculator">0.9 - 0.6</gadget>
<output>0.3</output>

<gadget id="calculator">6.02 - 0.3</gadget>
<output>5.72</output>

<gadget id="calculator">0.07 - 0.01</gadget>
<output>0.06</output>

<gadget id="calculator">5.72 + 0.06</gadget>
<output>5.78</output>

<result>5.78</result>