certain fertilizer manager produced 3 million tons of fertilizers this year, an increase of 20% over last year. How many tons of fertilizers were produced last year?
某化肥长今年生产化肥300万吨，比去年增长二成，去年生产化肥多少万吨？
<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">300 / (6/5)</gadget>
<output>250</output>

<result>250</result>