A chemical factory produced 1,280 tons of fertilizers in March, which was 320 tons less than planned. What percentage of the plan was completed?
某化工厂三月份生产化肥1280吨，比计划少生产320吨，完成计划的百分之几？
<gadget id="calculator">1_280 + 320</gadget>
<output>1_600</output>

<gadget id="calculator">1_280 / 1_600</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>