Uncle Zhang's family has had a bumper harvest of apples this year, with an output of 3.6 tons, an increase of 20% over last year. How many tons of apples did Uncle Zhang produce last year?
张大伯家今年苹果大丰收，产量达到3.6吨，比去年增产二成．张大伯家去年苹果的产量是多少吨？
<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">3.6 / (6/5)</gadget>
<output>3</output>

<result>3</result>