An electrical appliance factory plans to produce 1.8 million yuan this year, an increase of 20% over last year. How much will the output value increase this year compared to last year?
某电器厂计划今年产值180万元，比去年增加20%，今年比去年增加产值多少万元？
<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>

<gadget id="calculator">180 - 150</gadget>
<output>30</output>

<result>30</result>