Uncle Wang's apple orchard has had a bumper harvest this year, with an output of 54 tons, an increase of 20% over last year. How many tons is the increase in production this year compared to last year?
王老伯的苹果园今年大丰收，产量达54吨，比去年增产两成．今年比去年增产多少吨？
<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">54 / (6/5)</gadget>
<output>45</output>

<gadget id="calculator">54 - 45</gadget>
<output>9</output>

<result>9</result>