A factory completed the annual production task in the first half of the year (5/8), and completed the annual production task in the second half of the year (4/9). What percentage of the annual task was actually overfulfilled?
某工厂上半年完成全年生产任务的(5/8)，下半年完成全年生产任务的(4/9)，实际超额完成全年任务的几分之几？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(4/9) - 1</gadget>
<output>-5/9 = around -0.555556</output>

<gadget id="calculator">(5/8) + (-5/9)</gadget>
<output>5/72 = around 0.069444</output>

<result>5/72 = around 0.069444</result>