A certain power plant planned to complete an output value of 280,000 yuan last month, but actually completed 320,000 yuan. What percentage of the actual output value exceeded the plan?
某家电厂，上个月计划完成产值28万元，实际完成32万元，实际产值比计划超额几分之几？
<gadget id="calculator">32 - 28</gadget>
<output>4</output>

<gadget id="calculator">4 / 28</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>