When Xiaoqiang uses the vertical formula to calculate 5.8 plus a two-digit decimal, he regards the plus sign as a minus sign, and the calculated number is 3.24. Please help him choose the correct result
小强用竖式计算5.8加上一个两位小数时，把加号看成了减号，计算得数为3.24，请帮他选出正确的结果多少
<gadget id="calculator">5.8 - 3.24</gadget>
<output>2.56</output>

<gadget id="calculator">5.8 + 2.56</gadget>
<output>8.36</output>

<result>8.36</result>