A chemical factory produces 420 tons of chemical fertilizers in September, 20% more than planned. How many tons of chemical fertilizers are planned to be produced in September?
某化工厂九月份生产化肥420吨，比计划多生产20%，九月份计划生产化肥多少吨？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">420 / (6/5)</gadget>
<output>350</output>

<result>350</result>