Hongxing Township harvested 3,600 tons of corn this year, an increase of 20% over last year. How many tons of corn were harvested last year?
红星乡今年收玉米3600吨，比去年增产二成，去年收玉米多少吨？
<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">3_600 / (6/5)</gadget>
<output>3_000</output>

<result>3_000</result>