The cotton output of Yongle Township this year is 42,000 kilograms, a 40% increase over last year. How many kilograms of cotton was produced last year?
永乐乡今年棉花产量4.2万千克，比去年增产四成，去年棉花产量是多少万千克？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">4.2 / (7/5)</gadget>
<output>3</output>

<result>3</result>