A steel factory planned to produce 320 tons of steel in May, but the actual production exceeded the plan by 120 tons. What percentage of the plan was actually completed?
某钢厂五月份计划产钢320吨，实际比计划超产120吨，实际完成计划的百分之几？
<gadget id="calculator">320 + 120</gadget>
<output>440</output>

<gadget id="calculator">440 / 320</gadget>
<output>11/8 = around 1.375</output>

<result>11/8 = around 1.375</result>