The fertilizer factory planned to produce 84 tons of fertilizer in 30 days, but actually produced 0.2 tons more than planned every day, and actually completed the task a few days earlier than planned?
化肥厂计划用30天生产化肥84吨，实际每天比计划多生产0.2吨，实际比计划提前几天完成任务？
<gadget id="calculator">84 / 30</gadget>
<output>14/5 = around 2.8</output>

<gadget id="calculator">(14/5) + 0.2</gadget>
<output>3</output>

<gadget id="calculator">84 / 3</gadget>
<output>28</output>

<gadget id="calculator">30 - 28</gadget>
<output>2</output>

<result>2</result>