The output value of Guangming Company was 1.8 million yuan last year, an increase of 20% over the previous year. How much was the output value of the previous year?
光明公司去年产值180万元，比前年增加了二成，前年产值是多少万元？
<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">180 / (6/5)</gadget>
<output>150</output>

<result>150</result>