chemical fertilizer factory planned to produce 400 tons of fertilizers in October, but actually produced 480 tons. What percentage was the actual increase compared to the original plan?
某化肥厂计划十月份生产化肥400吨，实际生产了480吨，实际比原计划增产了百分之几？
<gadget id="calculator">480 - 400</gadget>
<output>80</output>

<gadget id="calculator">80 / 400</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>