Last year's corn production in our county was 72,000 tons, an increase of 20% over the previous year. What was the corn production of the previous year?
我县去年的玉米产量为7.2万吨，比前年增产二成，前年的玉米产量是多少？
<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">7.2 / (6/5)</gadget>
<output>6</output>

<result>6</result>