There are 40 pots of white chrysanthemums and 50 pots of yellow chrysanthemums on campus. How many percent are the number of pots of white chrysanthemums less than the number of pots of yellow chrysanthemums?
校园里有40盆白菊花和50盆黄菊花，白菊花的盆数比黄菊的盆数少百分之几？
<gadget id="calculator">50 - 40</gadget>
<output>10</output>

<gadget id="calculator">10 / 50</gadget>
<output>1/5 = around 0.2</output>

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