Xiaowan's wheat production this year is 2,500 kilograms, which is 500 kilograms more than last year. How much is the increase?
小婉家今年小麦产量是2500千克，比去年增产500千克，增产了百分之几？
<gadget id="calculator">2_500 - 500</gadget>
<output>2_000</output>

<gadget id="calculator">500 / 2_000</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>