The tractor factory produced 180 tractors in the first half of last month, and produced 140 tractors in the second half of the month, which just completed the production task. What percentage of the full month's production task was completed in the second half of the month?
拖拉机厂上个月上半月生产拖拉机180辆，下半月生产拖拉机140辆正好完成生产任务，下半月完成了全月生产任务的几分之几？
<gadget id="calculator">180 + 140</gadget>
<output>320</output>

<gadget id="calculator">140 / 320</gadget>
<output>7/16 = around 0.4375</output>

<result>7/16 = around 0.4375</result>