There are 500 chickens and 600 ducks in the farm, how many percent more ducks than chickens?
饲养场有鸡500只，鸭600只，鸭比鸡多百分之几？
<gadget id="calculator">600 - 500</gadget>
<output>100</output>

<gadget id="calculator">100 / 500</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>