Li Mingjia produced 3,500 kilograms of ginger last year, and this year it has increased by 20% compared to last year. How many kilograms will it produce this year?
李明家去年大姜产量3500千克，今年比去年增加了2成，今年产量多少千克？
<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_500 * (6/5)</gadget>
<output>4_200</output>

<result>4_200</result>